{"id":15,"date":"2023-09-17T11:10:24","date_gmt":"2023-09-17T11:10:24","guid":{"rendered":"https:\/\/mathority.org\/pt\/composicao-de-funcoes-funcao-composta\/"},"modified":"2023-09-17T11:10:24","modified_gmt":"2023-09-17T11:10:24","slug":"composicao-de-funcoes-funcao-composta","status":"publish","type":"post","link":"https:\/\/mathority.org\/pt\/composicao-de-funcoes-funcao-composta\/","title":{"rendered":"Composi\u00e7\u00e3o de fun\u00e7\u00f5es (fun\u00e7\u00e3o composta)"},"content":{"rendered":"<p>Neste artigo explicamos o que \u00e9 a fun\u00e7\u00e3o composta (ou composi\u00e7\u00e3o de fun\u00e7\u00f5es). Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos de fun\u00e7\u00f5es compostas e como \u00e9 calculado o dom\u00ednio deste tipo de fun\u00e7\u00f5es. Por fim, voc\u00ea encontrar\u00e1 as propriedades da composi\u00e7\u00e3o de fun\u00e7\u00f5es e v\u00e1rios exerc\u00edcios passo a passo para praticar. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfque-es-la-composicion-de-funciones\"><\/span> O que \u00e9 composi\u00e7\u00e3o de fun\u00e7\u00f5es?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A composi\u00e7\u00e3o de fun\u00e7\u00f5es consiste em avaliar <strong>sucessivamente<\/strong> o mesmo valor da vari\u00e1vel independente (x) em duas ou mais fun\u00e7\u00f5es.<\/strong> Por exemplo, compor as fun\u00e7\u00f5es (gof)(x) d\u00e1 a fun\u00e7\u00e3o composta g[f(x)]. <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/composition-des-fonctions.webp\" alt=\"composi\u00e7\u00e3o de fun\u00e7\u00f5es\" class=\"wp-image-637\" width=\"319\" height=\"115\" srcset=\"\" sizes=\"auto, \" data-src=\"\"><\/figure>\n<\/div>\n<p> A express\u00e3o da fun\u00e7\u00e3o composta<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5e3eba5c152156d18705b3afd68f487e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\circ f\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"36\" style=\"vertical-align: -4px;\"><\/p>\n<p> lemos \u201cf composto por g\u201d ou \u201cf seguido de g\u201d.<\/p>\n<p> Observe que a ordem \u00e9 importante na composi\u00e7\u00e3o da fun\u00e7\u00e3o, a fun\u00e7\u00e3o \u00e0 direita do s\u00edmbolo de composi\u00e7\u00e3o \u00e9 aplicada primeiro<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-876a58c2d2bc4ab866c0af7a5cdbf4b2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"22\" style=\"vertical-align: -5px;\"><\/p>\n<p> ent\u00e3o a fun\u00e7\u00e3o \u00e0 esquerda do s\u00edmbolo de composi\u00e7\u00e3o <\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e6c9247c09d7827160e8316d83ce2b2b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g).\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"26\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejemplo-de-composicion-de-funciones\"><\/span> Exemplo de composi\u00e7\u00e3o de fun\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Dada a defini\u00e7\u00e3o de fun\u00e7\u00e3o composta, vejamos um exemplo de como calcular a composi\u00e7\u00e3o de duas fun\u00e7\u00f5es.<\/p>\n<ul>\n<li> Dadas as duas fun\u00e7\u00f5es diferentes a seguir:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a9c8e90e6e8bb1e0837f424caaf5d1a0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=3x+1 \\qquad g(x)=\\cfrac{x+4}{2}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"243\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Calcule a fun\u00e7\u00e3o composta<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-624e8051bd11c44546f1270c91d069ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"75\" style=\"vertical-align: -5px;\"><\/p>\n<p> e avali\u00e1-lo em<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bf60bc9fcf312a246a055c15ee98033c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=3.\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"47\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> A composi\u00e7\u00e3o das fun\u00e7\u00f5es<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-624e8051bd11c44546f1270c91d069ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"75\" style=\"vertical-align: -5px;\"><\/p>\n<p> Isso significa que precisamos executar a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cb23add9f37be01b1ebf5923aef845ff_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x) = g\\Big(f(x)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"162\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Para resolver isso, substitu\u00edmos<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a7ee323bc5a3f73ad5e066b13bed5504_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"34\" style=\"vertical-align: -5px;\"><\/p>\n<p> por sua express\u00e3o alg\u00e9brica:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-179039983ee415873b7367ac255c1023_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(f(x)\\Big)= g\\Big(3x+1\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"166\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p> E agora tomamos a fun\u00e7\u00e3o de<em> <\/em><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8d124ddf8086d5d941fcb1de7c075c0d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x)=\\cfrac{x+4}{2}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"100\" style=\"vertical-align: -12px;\"><\/p>\n<p>e colocamos a express\u00e3o<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e4b24384ffd361d326faea85da151496_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"3x+1\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"49\" style=\"vertical-align: -2px;\"><\/p>\n<p> onde h\u00e1 um<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-845f2902b8bebf60c3c7372a7fbe4d02_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x:\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"19\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9407b8a097013423f71626368a65940b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(3x+1\\Big)=\\cfrac{(3x+1)+4}{2}=\\cfrac{3x+5}{2}\" title=\"Rendered by QuickLaTeX.com\" height=\"40\" width=\"275\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Desta forma j\u00e1 calculamos a fun\u00e7\u00e3o <em>f<\/em> composta por <em>g<\/em> :<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b46e81ab3496bd4daad7560eabda1caa_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x)=\\cfrac{3x+5}{2}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"152\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Finalmente, para avaliar a fun\u00e7\u00e3o composta em<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-3573bf1ea4c223bb71878796b2106731_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=3\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"43\" style=\"vertical-align: 0px;\"><\/p>\n<p> Basta calcular a imagem da fun\u00e7\u00e3o nesse valor: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b1a5472ce52fe01b6809224912a25539_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(3)=\\cfrac{3\\cdot 3+5}{2}=\\cfrac{14}{2}=7\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"237\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"dominio-de-la-funcion-compuesta\"><\/span> Dom\u00ednio de fun\u00e7\u00e3o composta<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Normalmente, quando realizamos opera\u00e7\u00f5es sobre fun\u00e7\u00f5es, o dom\u00ednio da fun\u00e7\u00e3o resultante \u00e9 a intersec\u00e7\u00e3o dos dom\u00ednios das fun\u00e7\u00f5es originais. No entanto, esta propriedade n\u00e3o \u00e9 satisfeita pela composi\u00e7\u00e3o de fun\u00e7\u00f5es.<\/p>\n<p> O <strong>dom\u00ednio da composi\u00e7\u00e3o de fun\u00e7\u00f5es<\/strong><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a1e321d1fe5674142070eefd17519b77_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g\\circ f)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"72\" style=\"vertical-align: -5px;\"><\/p>\n<p> \u00e9 equivalente ao conjunto de todos os valores de x no dom\u00ednio da fun\u00e7\u00e3o<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9c09a708375fde2676da319bcdfe8b24_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"10\" style=\"vertical-align: -4px;\"><\/p>\n<p> como<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a7ee323bc5a3f73ad5e066b13bed5504_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"34\" style=\"vertical-align: -5px;\"><\/p>\n<p> pertence ao dom\u00ednio da fun\u00e7\u00e3o<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-dce98a79808d5694e9c7a9f4545e45f2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g.\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cf27df12b66bbfdc7516fe47410cbf5c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(g\\circ f)=\\{x\\in\\text{Dom}(f)\\ | \\ f(x)\\in \\text{Dom}(g)\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"354\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Portanto, para calcular o dom\u00ednio de uma fun\u00e7\u00e3o composta, voc\u00ea deve primeiro encontrar o dom\u00ednio de cada fun\u00e7\u00e3o separadamente e depois o dom\u00ednio da fun\u00e7\u00e3o resultante da opera\u00e7\u00e3o. Assim, o dom\u00ednio de composi\u00e7\u00e3o das fun\u00e7\u00f5es ser\u00e1 composto por todos os valores que satisfa\u00e7am a condi\u00e7\u00e3o matem\u00e1tica anterior.<\/p>\n<p> \ud83d\udc49 Lembre-se, se voc\u00ea encontrar um problema que n\u00e3o sabe resolver, pode nos perguntar nos coment\u00e1rios abaixo! <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"propiedades-de-la-composicion-de-funciones\"><\/span> Propriedades da composi\u00e7\u00e3o de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As fun\u00e7\u00f5es compostas possuem as seguintes caracter\u00edsticas:<\/p>\n<ul>\n<li> A composi\u00e7\u00e3o de fun\u00e7\u00f5es possui propriedade associativa, portanto, a seguinte equa\u00e7\u00e3o \u00e9 sempre verdadeira:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bdfe1df3ab8d42f8d2af7f0d33628dba_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f\\circ (g\\circ h)=(f\\circ g)\\circ h\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"178\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<ul>\n<li> Em geral, a composi\u00e7\u00e3o da fun\u00e7\u00e3o n\u00e3o \u00e9 comutativa, portanto a ordem da opera\u00e7\u00e3o determina o resultado:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a641ded39b05f710e2cbc89f7c309275_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f\\circ g\\neq g\\circ f\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"96\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<ul>\n<li> O elemento neutro da composi\u00e7\u00e3o de fun\u00e7\u00f5es corresponde \u00e0 fun\u00e7\u00e3o identidade\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-da6458e64d1478ad56231146ce88db89_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x.\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"72\" style=\"vertical-align: -5px;\"><\/p>\n<p> Assim, qualquer fun\u00e7\u00e3o composta com a fun\u00e7\u00e3o identidade resulta na pr\u00f3pria fun\u00e7\u00e3o:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-161782350ae4c16617cbe0795e0fa35a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f\\circ id = id \\circ f = f\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"143\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d5ce8a7d2dbca796654cb483808271e4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"id = x\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"49\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<ul>\n<li> Calcular o inverso da composi\u00e7\u00e3o de duas fun\u00e7\u00f5es equivale a primeiro encontrar o inverso de cada fun\u00e7\u00e3o e depois determinar a fun\u00e7\u00e3o composta:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4e5f9cc891e8322cf737caf8fa76a92f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\circ g)^{-1}=f^{-1}\\circ g^{-1}\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"163\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<ul>\n<li> A fun\u00e7\u00e3o inversa tamb\u00e9m atua como elemento sim\u00e9trico da fun\u00e7\u00e3o composta, pois a composi\u00e7\u00e3o de uma fun\u00e7\u00e3o com sua inversa \u00e9 equivalente \u00e0 fun\u00e7\u00e3o identidade:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b801f112fdb719fad2b8c605ad831f0f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\circ f^{-1})^{-1}=(f^{-1}\\circ f)=id=x\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"254\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<ul>\n<li> A derivada da composi\u00e7\u00e3o de duas fun\u00e7\u00f5es \u00e9 calculada usando a regra da cadeia:<\/li>\n<\/ul>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-edf8bcb549ad025afce59e50c1cfbb94_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bigl(g\\circ f\\bigr)'(x)=g'\\Bigl(f(x)\\Bigr)\\cdot f'(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"223\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/cadeia-de-regras-derivada\/\">qual \u00e9 a regra da cadeia?<\/a><\/span> <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejercicios-resueltos-de-la-composicion-de-funciones\"><\/span> Exerc\u00edcios resolvidos sobre composi\u00e7\u00e3o de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 class=\"wp-block-heading\"> Exerc\u00edcio 1<\/h3>\n<p> Dadas as duas fun\u00e7\u00f5es a seguir:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8d22ce1010c1d1f2baa34bd5b96e4ca8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x-2 \\qquad g(x)= 5x + 4\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"241\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Calcule as composi\u00e7\u00f5es das fun\u00e7\u00f5es <em>f<\/em> composta por <em>g<\/em> e <em>g<\/em> composta por <em>f<\/em> . <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a1e321d1fe5674142070eefd17519b77_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g\\circ f)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"72\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8e664a72ceacc815125057558ab04c6a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\circ g)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"72\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E6F9EF\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E6F9EF\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>Veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> A composi\u00e7\u00e3o das fun\u00e7\u00f5es<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-624e8051bd11c44546f1270c91d069ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"75\" style=\"vertical-align: -5px;\"><\/p>\n<p> significa calcular a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cb23add9f37be01b1ebf5923aef845ff_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x) = g\\Big(f(x)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"162\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o, para resolver isso, substitu\u00edmos<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a7ee323bc5a3f73ad5e066b13bed5504_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"34\" style=\"vertical-align: -5px;\"><\/p>\n<p> pela sua express\u00e3o:<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cc434b7ab7aea14a249be3943671119b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x-2\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"98\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-13cb5a87becd27ff70f8fb5fb3b13239_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(f(x)\\Big)= g\\Big(x-2\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"157\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bf53f7369c2b0dfc1c60397d3dab8cd5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(x-2\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"68\" style=\"vertical-align: -11px;\"><\/p>\n<p> Isto significa que na express\u00e3o de<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a63a5d2293c895c25f8684ae82cefbf8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x) =5x+4\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"106\" style=\"vertical-align: -5px;\"><\/p>\n<p> voc\u00ea precisa substituir a vari\u00e1vel<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ede05c264bba0eda080918aaa09c4658_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> Para<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4f860e374f2a5f611e892f304ee0cc2a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x-2:\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"50\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-575d7c9f8dde8d78c1dd910ba1557ee2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(x-2\\Big) = 5(x-2) +4= 5x-10+4 = 5x-6\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"374\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ainda:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-df045f4ebc5cdfdcbd99a12307235058_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\left(g \\circ f\\right)(x) = 5x-6}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"149\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Por outro lado, para encontrar a fun\u00e7\u00e3o <em>g<\/em> composta por <em>f<\/em> voc\u00ea deve fazer o mesmo procedimento mas com a ordem inversa:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2e9be8f1bab4b7607441c7c1b7e3ad0c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}\\left(f \\circ g\\right)(x)&amp;= f\\Big(g(x)\\Big)\\\\[2ex]&amp;=f\\Big(5x+4\\Big)\\\\[2ex]&amp;=(5x+4)-2\\\\[2ex]&amp;=\\bm{5x+2}\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"167\" width=\"193\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Este exerc\u00edcio tamb\u00e9m demonstra a propriedade de que fun\u00e7\u00f5es compostas n\u00e3o s\u00e3o comutativas, pois o resultado depende da ordem em que as fun\u00e7\u00f5es s\u00e3o aplicadas.<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\"> Exerc\u00edcio 2<\/h3>\n<p> Dadas as duas fun\u00e7\u00f5es a seguir:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-3e7ff3894ffbafb8d56296b5b3d0a080_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle f(x) =x^2-3 \\qquad g(x)=\\frac{2x+3}{x+4}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"251\" style=\"vertical-align: -14px;\"><\/p>\n<\/p>\n<p> Calcula a composi\u00e7\u00e3o de fun\u00e7\u00f5es <em>f<\/em> compostas com <em>g<\/em> . <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a1e321d1fe5674142070eefd17519b77_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g\\circ f)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"72\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E6F9EF\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E6F9EF\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>Veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> A fun\u00e7\u00e3o <em>f<\/em> composta por <em>g<\/em> significa resolver a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cb23add9f37be01b1ebf5923aef845ff_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(x) = g\\Big(f(x)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"162\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Portanto, substitu\u00edmos a fun\u00e7\u00e3o f(x) pela sua express\u00e3o:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-28b41bd35ba991a996cf3a890aaeadf8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(f(x)\\Big)= g\\Big(x^2-3 \\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"165\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E agora temos que substituir<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ede05c264bba0eda080918aaa09c4658_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> Para<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ce3abcbe3e7405ea80705e3c169ae20d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x^2-3\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"48\" style=\"vertical-align: 0px;\"><\/p>\n<p> na express\u00e3o da fun\u00e7\u00e3o g(x):<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bf0bb412f9088845027b57d83a91073d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}g\\Big(x^2-3\\Big)&amp;=\\cfrac{2(x^2-3)+3}{(x^2-3)+4}\\\\[2ex]&amp;=\\cfrac{2x^2-6+3}{x^2+1}\\\\[2ex]&amp;=\\cfrac{2x^2-3}{x^2+1}\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"175\" width=\"206\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Resumindo, o resultado da composi\u00e7\u00e3o de fun\u00e7\u00f5es \u00e9: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6d625dc7f6b8e7af0988037119d473f6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\left(g \\circ f\\right)(x) =} \\cfrac{\\bm{2x^2-3}}{\\bm{x^2+1}}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"155\" style=\"vertical-align: -14px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\">Exerc\u00edcio 3<\/h3>\n<p> Dadas as duas fun\u00e7\u00f5es quadr\u00e1ticas a seguir:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a594c87e42327318112e78714904aa81_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle f(x) =x^2 \\qquad g(x)=g(x)= x^2-4x+8\" title=\"Rendered by QuickLaTeX.com\" height=\"21\" width=\"314\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Determine o resultado da seguinte composi\u00e7\u00e3o de fun\u00e7\u00f5es: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b7186993d7a14fceff2669b6d3f10585_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g\\circ f)(2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"71\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E6F9EF\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E6F9EF\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>Veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-706bfe49f02e183102e665a522eb803c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<p> consiste em encontrar a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-217743a7af2baefbc83e1c377f3f804f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(2) = g\\Big(f(2)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"160\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o, para resolver a fun\u00e7\u00e3o composta, primeiro calculamos <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-7bd87dc0308123b84fbe51bb86e0b009_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(2) :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"42\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c3421a45cc1c0ad35b18520e81ddc031_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x^2\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"75\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-671b30c79ed994c1923982d4a09d2eae_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(2)=2^2=4\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"106\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Portanto, como <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-69585295dd3a781afd9ebde9750865bc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(2)=4 :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"75\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f64414212eaa56a80be0b0ac9bd1be23_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(g \\circ f\\right)(2) = g\\Big(f(2)\\Big) = g\\big(4\\big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"218\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o, para encontrar o valor da fun\u00e7\u00e3o composta basta calcular <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e05e67fe2bbccdbd12d182052a93df62_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(4) :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"41\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9fc21e0e44e696ed36cd6e9a535cff09_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}\\left(g \\circ f\\right)(2)&amp;=g\\Big(f(2)\\Big)\\\\[2ex]&amp;= g\\big(4\\big)\\\\[2ex]&amp;=4^2-4\\cdot 4+8 \\\\[2ex]&amp;= 16 - 16 + 8\\\\[2ex]&amp;= 8\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"198\" width=\"198\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Em resumo, o resultado do problema de composi\u00e7\u00e3o de fun\u00e7\u00f5es \u00e9: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8d3e091b61117ac43ec8d17d4aa1d5b0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\left(g \\circ f\\right)(2) =8}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"107\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\">Exerc\u00edcio 4<\/h3>\n<p> Dadas as duas fun\u00e7\u00f5es a seguir:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0dabd181964a078fe5348b19efc168d5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle f(x)=\\frac{2x-2}{-x+7}\\qquad g(x)= x^2-1\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"256\" style=\"vertical-align: -14px;\"><\/p>\n<\/p>\n<p> Encontre o resultado de <em>g<\/em> composto por <em>f<\/em> em x=2: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-47390afb10cf5e3de6b0ff87edeff73b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\circ g)(2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"71\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E6F9EF\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E6F9EF\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>Veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> Neste caso, devemos calcular a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-e6de0edda1d8a4151fc88faa013a012e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(f \\circ g\\right)(2) = f\\Big(g(2)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"160\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o primeiro encontramos <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-809314c764c52d861c5b9671f5139d5a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(2) :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"41\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-c4f1e7070d6f986eac4f1483f9a30198_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x)=x^2-1\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"104\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-94e98ec0f41ba6635ee79cf96968e7ec_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(2)=2^2-1=4-1 = 3\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"198\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E ent\u00e3o, tipo <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-82da28e3a6fb3ea74c8e8ef8d022b202_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(2)=3 :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"73\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-bfe82e73b68c3b618cb0795bb6530af7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(f \\circ g\\right)(2) = f\\Big(g(2)\\Big) = f\\big(3\\big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"219\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o, para resolver a fun\u00e7\u00e3o composta, precisamos calcular <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b6d1361868e53506ddeca640a71aa321_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(3) :\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"42\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-9ec461a36a477af7bc703fd48bc3d4c2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}\\left(f \\circ g\\right)(2)&amp;=f\\Big(g(2)\\Big)\\\\[2ex]&amp;= f\\big(3\\big)\\\\[2ex]&amp;=\\cfrac{2\\cdot 3-2}{-3+7}\\\\[2ex]&amp;=\\cfrac{6-2}{-3+7}\\\\[2ex]&amp;=\\cfrac{4}{4}\\\\[2ex]&amp;=1\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"305\" width=\"162\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Concluindo, o resultado do exerc\u00edcio das fun\u00e7\u00f5es compostas \u00e9: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-8860734e1b816965b945b8ddf117912d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\left(f \\circ g\\right)(2)=1}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"106\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\">Exerc\u00edcio 5<\/h3>\n<p> Dadas as tr\u00eas fun\u00e7\u00f5es a seguir:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cde9a25a0c078e5e4491aef0682310d2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x) = x+1 \\qquad g(x)= 3x - 5\\qquad h(x) = \\sqrt{x} - 3\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"389\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Calcule a seguinte composi\u00e7\u00e3o das 3 fun\u00e7\u00f5es: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2ff91e1d3fdea1de8b629e4c17cee6fb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(h \\circ g \\circ f )(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"99\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__E6F9EF\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#E6F9EF\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>Veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> A express\u00e3o<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-cf14fee9bc19b3aaefabcac820afb69b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(h \\circ g \\circ f\\right)(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"102\" style=\"vertical-align: -5px;\"><\/p>\n<p> Isso significa que devemos calcular a seguinte fun\u00e7\u00e3o composta:<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-b6525a7b5ac0a86cc710225df5ebdf7b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left(h \\circ g \\circ f\\right)(x) = h \\bigg( g\\Big(f(x)\\Big) \\bigg)\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"225\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o primeiro determinamos <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0efee4b8fc162ee4ee30c15f1dac01c5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big( f(x)\\Big):\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"74\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a0ab9465f2aebf9fb7c81298eab5b8ca_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}g\\Big( f(x)\\Big)&amp;=g\\Big(x+1 \\Big)\\\\[2ex]&amp;= 3(x+1)-5\\\\[2ex]&amp;= 3x+3-5\\\\[2ex]&amp;= 3x-2\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"154\" width=\"181\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E agora calculamos<\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0512ac0197a64c0dce8e3a14b97efd1c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"h \\bigg( g\\Big(f(x)\\Big) \\bigg)\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"98\" style=\"vertical-align: -17px;\"><\/p>\n<p> . Para fazer isso, substitu\u00edmos a express\u00e3o encontrada em<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-2fde695528fc22ce481c7750cd392927_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\\Big(f(x)\\Big)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"62\" style=\"vertical-align: -11px;\"><\/p>\n<p> onde aparece um<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-ede05c264bba0eda080918aaa09c4658_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"10\" style=\"vertical-align: 0px;\"><\/p>\n<p> na fun\u00e7\u00e3o<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-240be4d8f4d59436eb46fefb7d2f7633_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"h(x):\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"43\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-89fbb7189eaf2dd3c622466c7313806d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}h \\bigg( g\\Big(f(x)\\Big) \\bigg)&amp;= h \\bigg(3x-2\\bigg)\\\\[2ex]&amp;= \\sqrt{3x-2} - 3\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"83\" width=\"220\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> N\u00e3o podemos simplificar mais a fun\u00e7\u00e3o composta. A composi\u00e7\u00e3o das tr\u00eas fun\u00e7\u00f5es resulta, portanto, em uma fun\u00e7\u00e3o irracional: <\/p>\n<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d3d99aa6d620db9304fa7121387dfd95_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\left(h \\circ g \\circ f\\right)(x) =\\sqrt{3x-2} - 3 }\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"222\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Neste artigo explicamos o que \u00e9 a fun\u00e7\u00e3o composta (ou composi\u00e7\u00e3o de fun\u00e7\u00f5es). Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos de fun\u00e7\u00f5es compostas e como \u00e9 calculado o dom\u00ednio deste tipo de fun\u00e7\u00f5es. Por fim, voc\u00ea encontrar\u00e1 as propriedades da composi\u00e7\u00e3o de fun\u00e7\u00f5es e v\u00e1rios exerc\u00edcios passo a passo para praticar. O que \u00e9 composi\u00e7\u00e3o &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/pt\/composicao-de-funcoes-funcao-composta\/\"> <span class=\"screen-reader-text\">Composi\u00e7\u00e3o de fun\u00e7\u00f5es (fun\u00e7\u00e3o composta)<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-15","post","type-post","status-publish","format-standard","hentry","category-representacao-de-funcao"],"yoast_head":"<!-- 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fun\u00e7\u00f5es (ou fun\u00e7\u00e3o composta). \u2705Com exerc\u00edcios resolvidos sobre composi\u00e7\u00e3o de fun\u00e7\u00f5es. \u2705\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mathority.org\/pt\/composicao-de-funcoes-funcao-composta\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-17T11:10:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/composition-des-fonctions.webp\" \/>\n<meta name=\"author\" content=\"Equipe Mathoridade\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Equipe Mathoridade\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" 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