{"id":355,"date":"2023-07-04T22:26:55","date_gmt":"2023-07-04T22:26:55","guid":{"rendered":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/"},"modified":"2023-07-04T22:26:55","modified_gmt":"2023-07-04T22:26:55","slug":"funcao-de-interpolacao-linear-e-quadratica","status":"publish","type":"post","link":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/","title":{"rendered":"Interpola\u00e7\u00e3o linear e quadr\u00e1tica"},"content":{"rendered":"<p>Nesta p\u00e1gina voc\u00ea aprender\u00e1 o que significa interpolar uma fun\u00e7\u00e3o. Especificamente, a interpola\u00e7\u00e3o linear e a interpola\u00e7\u00e3o quadr\u00e1tica s\u00e3o explicadas. Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos para n\u00e3o ter d\u00favidas sobre como uma fun\u00e7\u00e3o \u00e9 interpolada. <\/p>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-104\"><\/div>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfque-es-la-interpolacion-de-una-funcion\"><\/span> O que \u00e9 interpola\u00e7\u00e3o de fun\u00e7\u00e3o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A defini\u00e7\u00e3o de interpola\u00e7\u00e3o \u00e9 a seguinte: <\/p>\n<div style=\"background:linear-gradient(to bottom, #FFFFFF 0%, #FFE0B2 100%); padding-top: 23px; padding-bottom: 0.5px; padding-right: 30px; padding-left: 30px; border: 2px dashed #FF9B28; border-radius:20px;\">\n<p style=\"text-align:left\"> Em matem\u00e1tica, <strong>a interpola\u00e7\u00e3o<\/strong> \u00e9 um procedimento usado para aproximar o valor que uma fun\u00e7\u00e3o assume em um ponto de um intervalo cujos extremos s\u00e3o conhecidos. <\/p>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%c2%bfcual-es-la-diferencia-entre-la-interpolacion-y-la-extrapolacion\"><\/span> Qual \u00e9 a diferen\u00e7a entre interpola\u00e7\u00e3o e extrapola\u00e7\u00e3o? <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-105\"><strong> <\/strong><\/div>\n<\/div>\n<p>Interpolar e extrapolar t\u00eam significados muito semelhantes, pois ambos envolvem estimar o valor de uma fun\u00e7\u00e3o em um ponto a partir de dois pontos conhecidos.<\/p>\n<p> Por\u00e9m, a interpola\u00e7\u00e3o consiste em fazer uma aproxima\u00e7\u00e3o de um ponto localizado no intervalo formado por esses dois pontos conhecidos. Em vez disso, extrapolar significa estimar o valor da fun\u00e7\u00e3o em um ponto fora do intervalo em que consistem esses dois pontos conhecidos. <\/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\/interpolation-et-extrapolation-ou-interpoler-extrapoler.webp\" alt=\"interpola\u00e7\u00e3o e extrapola\u00e7\u00e3o ou interpola\u00e7\u00e3o e extrapola\u00e7\u00e3o\" class=\"wp-image-114\" width=\"370\" height=\"294\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<p> Como voc\u00ea pode ver no gr\u00e1fico acima, os pontos conhecidos s\u00e3o (2,3) e (6,5). Neste caso, queremos interpolar para x=4, porque est\u00e1 entre os pontos conhecidos, e, por outro lado, queremos extrapolar para x=8, porque est\u00e1 fora do intervalo conhecido.<\/p>\n<p> Obviamente, um valor interpolado \u00e9 muito mais confi\u00e1vel do que um valor extrapolado, porque na extrapola\u00e7\u00e3o assumimos que a fun\u00e7\u00e3o seguir\u00e1 um caminho semelhante. No entanto, \u00e9 poss\u00edvel que a inclina\u00e7\u00e3o da fun\u00e7\u00e3o mude fora dos limites do intervalo conhecido e a estimativa esteja errada.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"interpolacion-lineal\"><\/span> Interpola\u00e7\u00e3o linear<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A interpola\u00e7\u00e3o linear \u00e9 um caso especial de interpola\u00e7\u00e3o polinomial newtoniana. Neste caso, utiliza-se um polin\u00f4mio de primeiro grau, ou seja, uma fun\u00e7\u00e3o linear ou afim, para adivinhar o valor da fun\u00e7\u00e3o em um ponto. <\/p>\n<div style=\"padding-top: 23px; padding-bottom: 0.5px; padding-right: 30px; padding-left: 30px; border: 2px dashed #FF9B28; border-radius:20px;\">\n<p style=\"text-align:left\"> Dados dois pontos conhecidos,<\/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-99906702500e51b12e2859cc804a7b57_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_1(x_1,y_1)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" 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-4b79aabad6138add43cc540b4205d672_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_2(x_2,y_2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<p> , a f\u00f3rmula para realizar a interpola\u00e7\u00e3o linear \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-6f47466bf8293e2bb88ede2994c7b2ce_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{y_2-y_1}{x_2-x_1}\\cdot(x-x_1) + y_1\" title=\"Rendered by QuickLaTeX.com\" height=\"37\" width=\"205\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p style=\"text-align:left\"> Ouro<\/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> E<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-0af556714940c351c933bba8cf840796_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"><\/p>\n<p> s\u00e3o as coordenadas do ponto interpolado.<\/p>\n<\/div>\n<p> Podemos verificar que esta f\u00f3rmula corresponde \u00e0 equa\u00e7\u00e3o ponto-inclina\u00e7\u00e3o da reta. <\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejemplo-de-como-interpolar-linealmente\"><\/span> Exemplo de interpola\u00e7\u00e3o linear <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><meta charset=\"utf-8\"><\/p>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-106\"><\/div>\n<\/div>\n<p> A seguir veremos um problema como exemplo para finalizar o entendimento do conceito de interpola\u00e7\u00e3o linear:<\/p>\n<ul>\n<li> Numa f\u00e1brica, 2 itens s\u00e3o produzidos em 4 horas e 10 itens em 8 horas. Se o n\u00famero de itens produzidos tiver uma rela\u00e7\u00e3o linear com as horas trabalhadas, quantos itens ser\u00e3o produzidos em 5 horas?<\/li>\n<\/ul>\n<p> Primeiro, precisamos definir a fun\u00e7\u00e3o linear que relaciona as horas trabalhadas com os itens produzidos. Nesse caso, X ser\u00e3o horas trabalhadas e Y ser\u00e3o itens fabricados. Porque ser\u00e3o produzidos mais ou menos itens dependendo das horas trabalhadas, ou seja, a produ\u00e7\u00e3o depende das horas, e n\u00e3o o contr\u00e1rio.<\/p>\n<p> Pela afirma\u00e7\u00e3o sabemos que a fun\u00e7\u00e3o passa pelos pontos (4,2) e (8,10). \u00c9 portanto suficiente aplicar a f\u00f3rmula para interpolar no ponto<\/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-c60268650a59ab9a9a60303fd1414aa3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=5:\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"52\" 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-6f47466bf8293e2bb88ede2994c7b2ce_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{y_2-y_1}{x_2-x_1}\\cdot(x-x_1) + y_1\" title=\"Rendered by QuickLaTeX.com\" height=\"37\" width=\"205\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p> Substitu\u00edmos os valores dos pontos na 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-def761f7a698a9bc301b289bada81411_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{10-2}{8-4}\\cdot(5-4) + 2\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"179\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> E fazemos as opera\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-c5106bdb787f68d2f725eeb48e11eee1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{8}{4}\\cdot1 + 2 = 2\\cdot 1 +2 = 4\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"213\" style=\"vertical-align: -12px;\"><\/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-282fa83a6377c6833872c037158e74f4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y=4}\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"42\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Portanto, 5 horas produzir\u00e3o <strong>4 itens<\/strong> .<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"interpolacion-cuadratica\"><\/span> interpola\u00e7\u00e3o quadr\u00e1tica<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A interpola\u00e7\u00e3o quadr\u00e1tica envolve a interpola\u00e7\u00e3o com um polin\u00f4mio de segundo grau em vez de um polin\u00f4mio de grau 1. Portanto, neste caso, uma fun\u00e7\u00e3o <strong>quadr\u00e1tica<\/strong> ou <strong>par\u00e1bola<\/strong> \u00e9 usada.<\/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-f269c04d9aa0012a945df0050a50c90e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y = ax^2+bx+c\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"129\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Em geral, a interpola\u00e7\u00e3o de segunda ordem \u00e9 mais precisa do que a interpola\u00e7\u00e3o de primeira ordem porque \u00e9 de grau superior. Pelo contr\u00e1rio, \u00e9 necess\u00e1rio mais um ponto para poder realizar a interpola\u00e7\u00e3o.<\/p>\n<p> O matem\u00e1tico <a href=\"https:\/\/www.ugr.es\/~eaznar\/lagrange.htm\" target=\"_blank\" rel=\"noreferrer noopener\">Lagrange<\/a> desenvolveu uma f\u00f3rmula para encontrar a fun\u00e7\u00e3o de interpola\u00e7\u00e3o de ordem n. Para o caso de segunda ordem, o <strong>polin\u00f4mio de interpola\u00e7\u00e3o de Lagrange<\/strong> \u00e9 o 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-7964f224af5150a7765843814e8e2cc2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=\\cfrac{(x-x_1)(x-x_2)}{(x_0-x_1)(x-x_2)}\\cdot y_0+ \\cfrac{(x-x_0)(x-x_2)}{(x_1-x_0)(x_0-x_2)}\\cdot y_1+ \\cfrac{(x-x_0)(x-x_1)}{(x_2-x_0)(x_2-x_1)}\\cdot y_2\" title=\"Rendered by QuickLaTeX.com\" height=\"45\" width=\"588\" style=\"vertical-align: -17px;\"><\/p>\n<\/p>\n<p> onde os pontos conhecidos<\/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-99906702500e51b12e2859cc804a7b57_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_1(x_1,y_1)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<p> ,<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-4b79aabad6138add43cc540b4205d672_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_2(x_2,y_2)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" 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-dac17428ab0a8569f50aacbb6e002ca8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_3(x_3,y_3)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"74\" style=\"vertical-align: -5px;\"><\/p>\n<p> Eles s\u00e3o usados para encontrar o valor da fun\u00e7\u00e3o na abcissa<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-a9cc293b28f198c32e0356b52e2e23bd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x.\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"14\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Por\u00e9m, na pr\u00e1tica, o m\u00e9todo de interpola\u00e7\u00e3o de Lagrange geralmente n\u00e3o \u00e9 utilizado, mas a fun\u00e7\u00e3o quadr\u00e1tica \u00e9 calculada a partir dos 3 pontos observados, e ent\u00e3o o ponto a ser interpolado na fun\u00e7\u00e3o \u00e9 avaliado. Aqui est\u00e1 um exerc\u00edcio resolvido para ver como isso \u00e9 feito: <\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ejemplo-de-como-interpolar-cuadraticamente\"><\/span> Exemplo de interpola\u00e7\u00e3o quadr\u00e1tica <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><meta charset=\"utf-8\"><\/p>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-107\"><\/div>\n<\/div>\n<ul>\n<li> Determine a fun\u00e7\u00e3o quadr\u00e1tica que passa pelos pontos (0,1), (1,0) e (3,4) e interpole o valor de\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-6de4e73609a66312d9714a253f9ae3a2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=-1.\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"61\" style=\"vertical-align: 0px;\"><\/p>\n<\/li>\n<\/ul>\n<p> Como as fun\u00e7\u00f5es quadr\u00e1ticas s\u00e3o polin\u00f4mios de segunda ordem, a fun\u00e7\u00e3o de interpola\u00e7\u00e3o ser\u00e1 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-f269c04d9aa0012a945df0050a50c90e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y = ax^2+bx+c\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"129\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Portanto, \u00e9 necess\u00e1rio calcular os coeficientes<\/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-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> ,<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"b\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"8\" style=\"vertical-align: 0px;\"><\/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-41a04eeea923a1a0c28094a8a4680525_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"c\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> . Para fazer isso, substitu\u00edmos as coordenadas dos pontos conhecidos na 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-688e308fcaa3e4187058fb9145b6406a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left.\\begin{array}{l} 1 = a\\cdot 0^2+b\\cdot 0+c \\\\[2ex] 0 = a\\cdot 1^2+b\\cdot 1+c \\\\[2ex] 4 = a\\cdot 3^2+b\\cdot 3+c \\end{array} \\right\\} \\longrightarrow \\left.\\begin{array}{l} 1 = c \\\\[2ex] 0 = a+b+c \\\\[2ex] 4 = 9a+3b+c \\end{array} \\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"97\" width=\"363\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Agora resolvemos o sistema de equa\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-671f07a2311e3f14886d400a1418e3b2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left.\\begin{array}{l} 1 = c \\\\[2ex] 0 = a+b+c \\\\[2ex] 4 = 9a+3b+c \\end{array} \\right\\} \\begin{array}{l} \\\\[2ex] \\xrightarrow{c \\ = \\ 1} \\\\[2ex] &amp; \\end{array} \\left.\\begin{array}{l} c=1 \\\\[2ex] 0 = a+b+1 \\\\[2ex] 4 = 9a+3b+1 \\end{array}\\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"96\" width=\"361\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> J\u00e1 sabemos o valor de<\/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-41a04eeea923a1a0c28094a8a4680525_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"c\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> , podemos, portanto, resolver o sistema com o m\u00e9todo de substitui\u00e7\u00e3o: apagamos a inc\u00f3gnita<\/p>\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/mathority.org\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> da segunda equa\u00e7\u00e3o e substitua a express\u00e3o encontrada na \u00faltima 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-0be4db125be3270895ed6c2788990724_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\left.\\begin{array}{l} a=-b-1 \\\\[2ex]  4 = 9a+3b+1 \\end{array}\\right\\}\\longrightarrow \\left.\\begin{array}{l} a=-b-1 \\\\[2ex] 4 = 9(-b-1)+3b+1 \\end{array}\\right\\}\" title=\"Rendered by QuickLaTeX.com\" height=\"65\" width=\"389\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> encontramos o desconhecido<\/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-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"b\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> da \u00faltima 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-00a4283dc06626da922a6a85a95139ba_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"4 = -9b-9+3b+1\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"161\" style=\"vertical-align: -2px;\"><\/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-258e9e8665683efd2a410bcf9954055c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"12 =-6b\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"71\" 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-7efb512d185829bbfa278f182d5a8cfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"b=\\cfrac{12}{-6} = -2\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"101\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p> e encontre o valor de<\/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-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"><\/p>\n<p> com a segunda equa\u00e7\u00e3o do sistema:<\/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-0f22f34c05dfd7e8801920f909d975e7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"a=-(-2)-1 = 1\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"145\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> A fun\u00e7\u00e3o quadr\u00e1tica \u00e9, portanto, 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-e8967d1bbbab2f2d3b4be41d78bbefe1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{y = x^2-2x+1}\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"121\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Finalmente, interpolamos a abcissa<\/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-ad143a0d979362a51b48a48c9ca9f59e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"x=-1\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"56\" style=\"vertical-align: 0px;\"><\/p>\n<p> para calcular o valor da fun\u00e7\u00e3o neste ponto: <\/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-03ef4ea569c4913d354adeb167adf063_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"y=(-1)^2-2\\cdot(-1)+1=1+2+1=\\bm{4}\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"314\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p><meta charset=\"utf-8\"><\/p>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-108\"><\/div>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"aplicaciones-de-la-interpolacion\"><\/span> Aplica\u00e7\u00f5es de interpola\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Embora possa n\u00e3o parecer, a interpola\u00e7\u00e3o \u00e9 muito \u00fatil em matem\u00e1tica e estat\u00edstica. Por exemplo, serve para tentar prever o valor de uma fun\u00e7\u00e3o: a partir de uma s\u00e9rie de dados coletados, a linha de regress\u00e3o \u00e9 calculada e com ela voc\u00ea pode ter uma aproxima\u00e7\u00e3o de quanto valer\u00e1 a fun\u00e7\u00e3o em cada ponto.<\/p>\n<p> A interpola\u00e7\u00e3o de uma fun\u00e7\u00e3o pode ser feita manualmente, como vimos, ou com programas de computador como Excel ou MATLAB. Obviamente, \u00e9 muito mais confort\u00e1vel e r\u00e1pido fazer isso usando um computador.<\/p>\n<p> Por outro lado, a interpola\u00e7\u00e3o tamb\u00e9m \u00e9 usada para simplificar os c\u00e1lculos. Existem alguns programas de software que precisam realizar c\u00e1lculos complexos com fun\u00e7\u00f5es muito longas; portanto, \u00e0s vezes, a interpola\u00e7\u00e3o linear dessas fun\u00e7\u00f5es \u00e9 realizada para simplificar as opera\u00e7\u00f5es. <\/p>\n<p><meta charset=\"utf-8\"><\/p>\n<div class=\"adsb30\" style=\" margin:12px; text-align:center\">\n<div id=\"ezoic-pub-ad-placeholder-109\"><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Nesta p\u00e1gina voc\u00ea aprender\u00e1 o que significa interpolar uma fun\u00e7\u00e3o. Especificamente, a interpola\u00e7\u00e3o linear e a interpola\u00e7\u00e3o quadr\u00e1tica s\u00e3o explicadas. Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos para n\u00e3o ter d\u00favidas sobre como uma fun\u00e7\u00e3o \u00e9 interpolada. O que \u00e9 interpola\u00e7\u00e3o de fun\u00e7\u00e3o? A defini\u00e7\u00e3o de interpola\u00e7\u00e3o \u00e9 a seguinte: Em matem\u00e1tica, a interpola\u00e7\u00e3o \u00e9 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\"> <span class=\"screen-reader-text\">Interpola\u00e7\u00e3o linear e quadr\u00e1tica<\/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-355","post","type-post","status-publish","format-standard","hentry","category-representacao-de-funcao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Interpola\u00e7\u00e3o linear e quadr\u00e1tica - Matoridade<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Interpola\u00e7\u00e3o linear e quadr\u00e1tica - Matoridade\" \/>\n<meta property=\"og:description\" content=\"Nesta p\u00e1gina voc\u00ea aprender\u00e1 o que significa interpolar uma fun\u00e7\u00e3o. Especificamente, a interpola\u00e7\u00e3o linear e a interpola\u00e7\u00e3o quadr\u00e1tica s\u00e3o explicadas. Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos para n\u00e3o ter d\u00favidas sobre como uma fun\u00e7\u00e3o \u00e9 interpolada. O que \u00e9 interpola\u00e7\u00e3o de fun\u00e7\u00e3o? A defini\u00e7\u00e3o de interpola\u00e7\u00e3o \u00e9 a seguinte: Em matem\u00e1tica, a interpola\u00e7\u00e3o \u00e9 &hellip; Interpola\u00e7\u00e3o linear e quadr\u00e1tica Leia mais &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-04T22:26:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/interpolation-et-extrapolation-ou-interpoler-extrapoler.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\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\"},\"author\":{\"name\":\"Equipe Mathoridade\",\"@id\":\"https:\/\/mathority.org\/pt\/#\/schema\/person\/26defeb7b79f5baaedafa33a1ac6ac00\"},\"headline\":\"Interpola\u00e7\u00e3o linear e quadr\u00e1tica\",\"datePublished\":\"2023-07-04T22:26:55+00:00\",\"dateModified\":\"2023-07-04T22:26:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\"},\"wordCount\":976,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/mathority.org\/pt\/#organization\"},\"articleSection\":[\"Representa\u00e7\u00e3o de fun\u00e7\u00e3o\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\",\"url\":\"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/\",\"name\":\"Interpola\u00e7\u00e3o linear e quadr\u00e1tica - 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Matoridade","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/","og_locale":"pt_BR","og_type":"article","og_title":"Interpola\u00e7\u00e3o linear e quadr\u00e1tica - Matoridade","og_description":"Nesta p\u00e1gina voc\u00ea aprender\u00e1 o que significa interpolar uma fun\u00e7\u00e3o. Especificamente, a interpola\u00e7\u00e3o linear e a interpola\u00e7\u00e3o quadr\u00e1tica s\u00e3o explicadas. Al\u00e9m disso, voc\u00ea poder\u00e1 ver v\u00e1rios exemplos para n\u00e3o ter d\u00favidas sobre como uma fun\u00e7\u00e3o \u00e9 interpolada. O que \u00e9 interpola\u00e7\u00e3o de fun\u00e7\u00e3o? A defini\u00e7\u00e3o de interpola\u00e7\u00e3o \u00e9 a seguinte: Em matem\u00e1tica, a interpola\u00e7\u00e3o \u00e9 &hellip; Interpola\u00e7\u00e3o linear e quadr\u00e1tica Leia mais &raquo;","og_url":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/","article_published_time":"2023-07-04T22:26:55+00:00","og_image":[{"url":"https:\/\/mathority.org\/wp-content\/uploads\/2023\/07\/interpolation-et-extrapolation-ou-interpoler-extrapoler.webp"}],"author":"Equipe Mathoridade","twitter_card":"summary_large_image","twitter_misc":{"Escrito por":"Equipe Mathoridade","Est. tempo de leitura":"5 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/#article","isPartOf":{"@id":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/"},"author":{"name":"Equipe Mathoridade","@id":"https:\/\/mathority.org\/pt\/#\/schema\/person\/26defeb7b79f5baaedafa33a1ac6ac00"},"headline":"Interpola\u00e7\u00e3o linear e quadr\u00e1tica","datePublished":"2023-07-04T22:26:55+00:00","dateModified":"2023-07-04T22:26:55+00:00","mainEntityOfPage":{"@id":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/"},"wordCount":976,"commentCount":0,"publisher":{"@id":"https:\/\/mathority.org\/pt\/#organization"},"articleSection":["Representa\u00e7\u00e3o de fun\u00e7\u00e3o"],"inLanguage":"pt-BR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/","url":"https:\/\/mathority.org\/pt\/funcao-de-interpolacao-linear-e-quadratica\/","name":"Interpola\u00e7\u00e3o linear e quadr\u00e1tica - 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