{"id":14,"date":"2023-09-17T11:11:04","date_gmt":"2023-09-17T11:11:04","guid":{"rendered":"https:\/\/mathority.org\/pt\/operacoes-com-funcoes-soma-subtracao-produto-divisao\/"},"modified":"2023-09-17T11:11:04","modified_gmt":"2023-09-17T11:11:04","slug":"operacoes-com-funcoes-soma-subtracao-produto-divisao","status":"publish","type":"post","link":"https:\/\/mathority.org\/pt\/operacoes-com-funcoes-soma-subtracao-produto-divisao\/","title":{"rendered":"Opera\u00e7\u00f5es com fun\u00e7\u00f5es: adi\u00e7\u00e3o, subtra\u00e7\u00e3o, produto, divis\u00e3o e composi\u00e7\u00e3o"},"content":{"rendered":"<p>Neste artigo explicamos quais opera\u00e7\u00f5es podem ser realizadas com fun\u00e7\u00f5es. Voc\u00ea poder\u00e1 ver a explica\u00e7\u00e3o e tamb\u00e9m exerc\u00edcios resolvidos sobre opera\u00e7\u00f5es com fun\u00e7\u00f5es. E por fim, voc\u00ea encontrar\u00e1 as propriedades das opera\u00e7\u00f5es com as fun\u00e7\u00f5es. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfcuales-son-las-operaciones-con-funciones\"><\/span> O que s\u00e3o opera\u00e7\u00f5es com fun\u00e7\u00f5es?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>Voc\u00ea pode realizar 5 tipos diferentes de opera\u00e7\u00f5es com fun\u00e7\u00f5es: adi\u00e7\u00e3o, subtra\u00e7\u00e3o, produto, divis\u00e3o e composi\u00e7\u00e3o.<\/strong> Ou seja, duas fun\u00e7\u00f5es podem ser somadas, subtra\u00eddas, multiplicadas, divididas ou compostas.<\/p>\n<p> A seguir veremos como \u00e9 realizado cada tipo de opera\u00e7\u00e3o com fun\u00e7\u00f5es e as caracter\u00edsticas de cada uma delas.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"suma-de-funciones\"><\/span> Soma de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> O valor da <strong>soma (ou adi\u00e7\u00e3o) de duas fun\u00e7\u00f5es<\/strong> \u00e9 igual \u00e0 soma do valor de cada fun\u00e7\u00e3o. Ou seja, para calcular a imagem de uma fun\u00e7\u00e3o soma, basta somar as imagens das fun\u00e7\u00f5es envolvidas na opera\u00e7\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-05d79929a6f09f9747f92a0485e045c6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f+g)(x)=f(x)+g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"190\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Al\u00e9m disso, o dom\u00ednio da soma de duas fun\u00e7\u00f5es \u00e9 a intersec\u00e7\u00e3o do dom\u00ednio de cada fun\u00e7\u00e3o somada.<\/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-1d672f546b07792336a3c0df21714035_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f+g)=\\text{Dom}(f)\\cap\\text{Dom}(g)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"256\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Vamos ver como duas fun\u00e7\u00f5es s\u00e3o adicionadas usando um exemplo:<\/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-eb89c6f33e5dda0aa251134d7fb7515d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x^2+1 \\qquad g(x)=\\log(x-1)\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"275\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Primeiro adicionamos as duas 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-3a6973d112f91431b92068e09e2e52f2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f+g)(x)=f(x)+g(x)=x^2+1+\\log(x-1)\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"361\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> E agora encontramos o dom\u00ednio da fun\u00e7\u00e3o soma. Para fazer isso, calculamos o dom\u00ednio de cada fun\u00e7\u00e3o separadamente:<\/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-7d28f947af0d791ef966ef6db609b2dd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f)=\\mathbb{R}\\qquad\\text{Dom}(g)=(1,+\\infty)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"279\" style=\"vertical-align: -5px;\"><\/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\">como calcular o dom\u00ednio de uma fun\u00e7\u00e3o<\/a><\/span><\/p>\n<p> Ent\u00e3o, o dom\u00ednio da fun\u00e7\u00e3o resultante da opera\u00e7\u00e3o ser\u00e1:<\/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-6266cd082c8e8012781d9c432803b97c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f+g)=\\text{Dom}(f)\\cap\\text{Dom}(g)=(1,+\\infty)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"343\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Cada opera\u00e7\u00e3o com fun\u00e7\u00f5es deve vir acompanhada de seu dom\u00ednio para definir completamente o resultado.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"resta-de-funciones\"><\/span> Subtra\u00e7\u00e3o de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> A imagem da <strong>subtra\u00e7\u00e3o (ou diferen\u00e7a) de duas fun\u00e7\u00f5es<\/strong> \u00e9 a subtra\u00e7\u00e3o das imagens de cada fun\u00e7\u00e3o participante da opera\u00e7\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-47e4822be6bdbfbe3c5692b11ffde668_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f-g)(x)=f(x)-g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"190\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Tal como acontece com a fun\u00e7\u00e3o de adi\u00e7\u00e3o, o dom\u00ednio de subtra\u00e7\u00e3o de duas fun\u00e7\u00f5es \u00e9 equivalente \u00e0 intersec\u00e7\u00e3o do dom\u00ednio de cada fun\u00e7\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-12f87e8f009c4aff19495536484faf38_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f-g)=\\text{Dom}(f)\\cap\\text{Dom}(g)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"256\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Assim, se uma fun\u00e7\u00e3o n\u00e3o for definida em um determinado valor da vari\u00e1vel independente x, a fun\u00e7\u00e3o resultante da subtra\u00e7\u00e3o tamb\u00e9m n\u00e3o ser\u00e1 definida.<\/p>\n<p> Vamos ver como duas fun\u00e7\u00f5es s\u00e3o subtra\u00eddas atrav\u00e9s de um exemplo:<\/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-f01e404815edd977e137b37371cb6e05_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=\\sqrt{x}\\qquad g(x)=\\cfrac{3}{x-4}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"218\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> Primeiro subtra\u00edmos as duas 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-e78ab8524f406ba3c30077c979d377ee_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f-g)(x)=f(x)-g(x)=\\sqrt{x}-\\cfrac{3}{x-4}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"304\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> E ent\u00e3o determinamos o dom\u00ednio da fun\u00e7\u00e3o de subtra\u00e7\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-7efe9d2026c53d15e8f4cd4f34b0bd30_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f)=[0,+\\infty)\\qquad\\text{Dom}(g)=\\mathbb{R}-\\{4\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"325\" 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-a54037cea9dc3305838c3bbf1bdf0d22_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f-g)=\\text{Dom}(f)\\cap\\text{Dom}(g)=[0,4)\\cup (4,+\\infty)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"400\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"producto-de-funciones\"><\/span> Produto principal<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> Para calcular o <strong>produto ou (a multiplica\u00e7\u00e3o) de duas fun\u00e7\u00f5es<\/strong> , basta multiplicar as express\u00f5es de cada fun\u00e7\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-c222808349e646fd86841f9bb7a38004_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\cdot g)(x)=f(x)\\cdot g(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"172\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Por outro lado, o dom\u00ednio da fun\u00e7\u00e3o produto \u00e9 o conjunto de interse\u00e7\u00f5es do dom\u00ednio de cada fun\u00e7\u00e3o multiplicada.<\/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-8b74f4595a7baae6c41076fe38b1543d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f\\cdot g)=\\text{Dom}(f)\\cap\\text{Dom}(g)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"248\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Por exemplo, se tivermos 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-3be55eb65d1ffa1084bbd6f06735c2f8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=\\sqrt[3]{x^2-1}\\qquad g(x)=\\cfrac{2}{3x+6}\" title=\"Rendered by QuickLaTeX.com\" height=\"40\" width=\"266\" style=\"vertical-align: -14px;\"><\/p>\n<\/p>\n<p> Primeiramente realizamos o funcionamento do produto com as duas 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-b67aa52a71b46330da18ffc851e28633_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(f\\cdot g)(x)=f(x)\\cdot g(x)=\\sqrt[3]{x^2-1}\\cdot\\cfrac{2}{3x+6}=\\cfrac{2\\sqrt[3]{x^2-1}}{3x+6}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"425\" style=\"vertical-align: -14px;\"><\/p>\n<\/p>\n<p> E, por fim, encontramos o dom\u00ednio da fun\u00e7\u00e3o resultante da opera\u00e7\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-05c45e48da37aeb7182e6f91d6af9710_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f)=\\mathbb{R}\\qquad\\text{Dom}(g)=\\mathbb{R}-\\{-2\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"292\" 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-7afa18c599135168980fa659c224af54_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f\\cdot g)=\\text{Dom}(f)\\cap\\text{Dom}(g)=(-\\infty,-2)\\cup (-2,+\\infty)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"443\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"division-de-funciones\"><\/span> Distribui\u00e7\u00e3o de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> O resultado num\u00e9rico de uma <strong>divis\u00e3o (ou quociente) de duas fun\u00e7\u00f5es<\/strong> corresponde \u00e0 seguinte equa\u00e7\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-96cbf5f56799b59d7d3561d8317b5843_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\left(\\frac{f}{g}\\right)(x)=\\frac{f(x)}{g(x)}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"125\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<p> Por\u00e9m, o dom\u00ednio de divis\u00e3o de duas fun\u00e7\u00f5es \u00e9 o conjunto de interse\u00e7\u00f5es do dom\u00ednio de cada fun\u00e7\u00e3o menos todo o x que anula a fun\u00e7\u00e3o que atua como divisor, pois caso contr\u00e1rio obter\u00edamos uma indetermina\u00e7\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-bf8de882e1d983090cbb3ee8f9481b26_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\text{Dom}\\left(\\frac{f}{g}\\right)(x)=\\text{Dom}(f)\\cap\\text{Dom}(g)-\\{x:g(x)=0\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"402\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<p> Como exemplo, dividiremos as seguintes 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-943c191746edc19963301033120e709e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=5^x \\qquad g(x)=x-3\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"208\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> A distribui\u00e7\u00e3o das fun\u00e7\u00f5es \u00e9 a seguinte:<\/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-6eae89de60ef299ba6f5fe719a73d3c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\left(\\frac{f}{g}\\right)(x)=\\frac{f(x)}{g(x)}=\\cfrac{5^x}{x-3}\" title=\"Rendered by QuickLaTeX.com\" height=\"44\" width=\"193\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<p> Por outro lado, o dom\u00ednio de cada fun\u00e7\u00e3o separadamente consiste em todos os n\u00fameros reais<\/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-ce037318101ca86303b9aa66a1901cfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(f)=\\mathbb{R}\\qquad\\text{Dom}(g)=\\mathbb{R}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"230\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Por\u00e9m, como n\u00e3o pode haver zero no denominador de uma fra\u00e7\u00e3o, no dom\u00ednio da fun\u00e7\u00e3o resultante devemos retirar todos os valores que anulam o denominador (x=3). <\/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-640a8e1e712348e99aed1f091cc1d2e1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\text{Dom}\\left(\\frac{f}{g}\\right)(x)=\\text{Dom}(f)\\cap\\text{Dom}(g)-\\{x:g(x)=0\\}=\\mathbb{R}-\\{3\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"43\" width=\"486\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"composicion-de-funciones\"><\/span> Composi\u00e7\u00e3o de fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> A composi\u00e7\u00e3o de fun\u00e7\u00f5es \u00e9 a opera\u00e7\u00e3o mais dif\u00edcil de resolver, pois \u00e9 o conceito mais complicado.<\/p>\n<p> <strong>A composi\u00e7\u00e3o de fun\u00e7\u00f5es<\/strong> consiste na aplica\u00e7\u00e3o sucessiva de duas fun\u00e7\u00f5es. Algebricamente, a composi\u00e7\u00e3o de duas fun\u00e7\u00f5es \u00e9 expressa da seguinte forma:<\/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-3b528c2a40063326606b5f32aa713a48_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"(g\\circ f)(x)=g\\Bigl(f(x)\\Bigr)\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"159\" style=\"vertical-align: -11px;\"><\/p>\n<\/p>\n<p> Por outro lado, o dom\u00ednio de 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-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> Por exemplo, 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-aef98c61f474a5f3202c4b2003460e39_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=x^2+1 \\qquad g(x)=3x-4\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"248\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Para encontrar 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-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> seguido pela<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d208fd391fa57c168dc0f151de829fee_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"><\/p>\n<p> precisamos substituir a 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-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> 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-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 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-0f8c9f85fa0ccfcfaa5c014024ef5afb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"g(x):\" 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-f48079d61cf80409fdbf6610b5724189_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}(g\\circ f)(x)&amp;=g\\Bigl(f(x)\\Bigr)\\\\[2ex]&amp;= g\\Bigl(x^2+1\\Bigr)\\\\[2ex]&amp;=3(x^2+1)-4\\\\[2ex]&amp;=3x^2+3-4\\\\[2ex]&amp;=3x^2-1\\end{aligned}\" title=\"Rendered by QuickLaTeX.com\" height=\"211\" width=\"198\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Neste caso, o dom\u00ednio de ambas as fun\u00e7\u00f5es consiste inteiramente em n\u00fameros reais, portanto o dom\u00ednio da fun\u00e7\u00e3o composta tamb\u00e9m consistir\u00e1 em n\u00fameros reais.<\/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-0fde0ee091521197399bcfb6f5a25e0d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Dom}(g\\circ f)=\\mathbb{R}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"124\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Como voc\u00ea pode ver, compor fun\u00e7\u00f5es n\u00e3o \u00e9 uma opera\u00e7\u00e3o simples de entender. Portanto, recomendamos que voc\u00ea pratique os seguintes exerc\u00edcios de composi\u00e7\u00e3o de fun\u00e7\u00f5es:<\/p>\n<p> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <span style=\"text-decoration: underline;\"><a href=\"https:\/\/mathority.org\/pt\/composicao-de-funcoes-funcao-composta\/\">exerc\u00edcios resolvidos sobre composi\u00e7\u00e3o de fun\u00e7\u00f5es<\/a><\/span> <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"propiedades-de-las-operaciones-con-funciones\"><\/span> Propriedades de opera\u00e7\u00f5es com fun\u00e7\u00f5es<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> De todas as opera\u00e7\u00f5es com fun\u00e7\u00f5es, a soma e o produto s\u00e3o caracterizados pelas seguintes propriedades:<\/p>\n<ul>\n<li> <strong>Propriedade associativa<\/strong> : A ordem em que 3 ou mais fun\u00e7\u00f5es s\u00e3o adicionadas ou multiplicadas \u00e9 irrelevante.<\/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-dcc11a4fb89684274cc991e28c8c41e7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)+\\bigl[g(x)+h(x)\\bigr]=\\bigl[f(x)+g(x)\\bigr]+h(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"342\" style=\"vertical-align: -7px;\"><\/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-897f10dffa02ae69086d8181e6f2aa96_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\cdot \\bigl[g(x)\\cdot h(x)\\bigr]=\\bigl[f(x)\\cdot g(x)\\bigr] \\cdot h(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"307\" style=\"vertical-align: -7px;\"><\/p>\n<\/p>\n<ul>\n<li> <strong>Propriedade comutativa<\/strong> : a ordem de adi\u00e7\u00e3o ou multiplica\u00e7\u00e3o de duas fun\u00e7\u00f5es n\u00e3o modifica 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-aeae9f256e25d89fd73e9231bb1052dd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)+g(x)=g(x)+f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"201\" 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-3c2a65bff0ccb6ccb9976e3ed252a636_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\cdot g(x)=g(x)\\cdot f(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"183\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<ul>\n<li> <strong>Elemento neutro:<\/strong> a opera\u00e7\u00e3o de soma e a opera\u00e7\u00e3o de produto t\u00eam fun\u00e7\u00f5es de elemento neutro constantes\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0bce6c022ed0fc63f4659af75888f96c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=0\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"67\" style=\"vertical-align: -5px;\"><\/p>\n<p> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4e21c119443e5009abfe189df9ee4763_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)=1\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"66\" style=\"vertical-align: -5px;\"><\/p>\n<p> respectivamente.<\/li>\n<\/ul>\n<ul>\n<li> <strong>Elemento sim\u00e9trico<\/strong> : a fun\u00e7\u00e3o soma tem a fun\u00e7\u00e3o oposta\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-d9e2fee8a3b8710948027f726423744e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-f(x).\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"51\" style=\"vertical-align: -5px;\"><\/p>\n<\/li>\n<\/ul>\n<ul>\n<li> <strong>Propriedade distributiva<\/strong> : esta propriedade liga a soma e o produto das opera\u00e7\u00f5es, e baseia-se na seguinte igualdade:<\/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-bbeb83744999f8dfe2ee15a3501f50ac_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"f(x)\\cdot \\bigl[g(x)+h(x)\\bigr]=f(x)\\cdot g(x)+f(x)\\cdot h(x)\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"357\" style=\"vertical-align: -7px;\"><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Neste artigo explicamos quais opera\u00e7\u00f5es podem ser realizadas com fun\u00e7\u00f5es. Voc\u00ea poder\u00e1 ver a explica\u00e7\u00e3o e tamb\u00e9m exerc\u00edcios resolvidos sobre opera\u00e7\u00f5es com fun\u00e7\u00f5es. E por fim, voc\u00ea encontrar\u00e1 as propriedades das opera\u00e7\u00f5es com as fun\u00e7\u00f5es. O que s\u00e3o opera\u00e7\u00f5es com fun\u00e7\u00f5es? Voc\u00ea pode realizar 5 tipos diferentes de opera\u00e7\u00f5es com fun\u00e7\u00f5es: adi\u00e7\u00e3o, subtra\u00e7\u00e3o, produto, divis\u00e3o &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/pt\/operacoes-com-funcoes-soma-subtracao-produto-divisao\/\"> <span class=\"screen-reader-text\">Opera\u00e7\u00f5es com fun\u00e7\u00f5es: adi\u00e7\u00e3o, subtra\u00e7\u00e3o, produto, divis\u00e3o e composi\u00e7\u00e3o<\/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-14","post","type-post","status-publish","format-standard","hentry","category-representacao-de-funcao"],"yoast_head":"<!-- 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