{"id":28895,"date":"2021-04-23T13:00:40","date_gmt":"2021-04-23T13:00:40","guid":{"rendered":"http:\/\/toposuranos.com\/material\/?p=28895"},"modified":"2024-09-22T02:11:01","modified_gmt":"2024-09-22T02:11:01","slug":"a-equacao-das-parabolas-definicoes-e-propriedades","status":"publish","type":"post","link":"https:\/\/toposuranos.com\/material\/pt\/a-equacao-das-parabolas-definicoes-e-propriedades\/","title":{"rendered":"A Equa\u00e7\u00e3o das Par\u00e1bolas: Defini\u00e7\u00f5es e Propriedades"},"content":{"rendered":"<p><center><\/p>\n<h1>A Equa\u00e7\u00e3o das Par\u00e1bolas: Defini\u00e7\u00f5es e Propriedades<\/h1>\n<p><em><strong>Resumo:<\/strong><br \/>\n   Esta aula explora a defini\u00e7\u00e3o e dedu\u00e7\u00e3o da equa\u00e7\u00e3o de uma par\u00e1bola, destacando sua origem como o conjunto de pontos equidistantes a um foco e uma diretriz. A partir desse conceito, revisam-se no\u00e7\u00f5es pr\u00e9vias como a dist\u00e2ncia entre pontos no plano cartesiano e a transla\u00e7\u00e3o de gr\u00e1ficos, o que permite introduzir a equa\u00e7\u00e3o fundamental das par\u00e1bolas e sua rela\u00e7\u00e3o com os polin\u00f4mios de segundo grau. Finalmente, deduz-se a equa\u00e7\u00e3o geral das par\u00e1bolas com v\u00e9rtice em qualquer ponto e transforma-se na forma can\u00f4nica de um polin\u00f4mio quadr\u00e1tico.<br \/>\n   <\/em><\/p>\n<p><strong>Objetivos de Aprendizagem:<\/strong><br \/>\n   Ao finalizar esta aula, o estudante ser\u00e1 capaz de:<\/p>\n<ol style=\"text-align:left;\">\n<li><strong>Compreender<\/strong> a defini\u00e7\u00e3o geom\u00e9trica de uma par\u00e1bola como o conjunto de pontos equidistantes de um foco e uma diretriz.<\/li>\n<li><strong>Deduzir<\/strong> a equa\u00e7\u00e3o fundamental da par\u00e1bola utilizando a rela\u00e7\u00e3o entre a dist\u00e2ncia foco-diretriz.<\/li>\n<li><strong>Compreender<\/strong> a rela\u00e7\u00e3o entre a par\u00e1bola e os polin\u00f4mios de segundo grau.<\/li>\n<li><strong>Derivar<\/strong> a equa\u00e7\u00e3o geral das par\u00e1bolas com v\u00e9rtice em qualquer ponto (h,k).<\/li>\n<\/ol>\n<p>   <strong>\u00cdNDICE DE CONTE\u00daDOS<\/strong><br \/>\n   <a href=\"#1\"><strong>Ideias pr\u00e9vias para a obten\u00e7\u00e3o da equa\u00e7\u00e3o das par\u00e1bolas<\/strong><\/a><br \/>\n   <a href=\"#2\">No\u00e7\u00e3o geom\u00e9trica das par\u00e1bolas<\/a><br \/>\n   <a href=\"#3\">Dist\u00e2ncia entre dois pontos do plano cartesiano<\/a><br \/>\n   <a href=\"#4\">Transla\u00e7\u00e3o de Gr\u00e1ficos<\/a><br \/>\n   <a href=\"#5\"><strong>Defini\u00e7\u00e3o de Par\u00e1bola<\/strong><\/a><br \/>\n   <a href=\"#6\">Dedu\u00e7\u00e3o da Equa\u00e7\u00e3o Fundamental das Par\u00e1bolas<\/a><br \/>\n   <a href=\"#7\">A Equa\u00e7\u00e3o Geral das Par\u00e1bolas<\/a><br \/>\n   <a href=\"#8\">Equa\u00e7\u00e3o Can\u00f4nica das Par\u00e1bolas e os Polin\u00f4mios de Segundo Grau<\/a>\n   <\/p>\n<p>   <\/center><\/p>\n<p>   <center><iframe class=\"lazyload\" width=\"560\" height=\"315\" data-src=\"https:\/\/www.youtube.com\/embed\/O2EYxxK03jU\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/center><\/p>\n<p>   <a name=\"1\"><\/a><\/p>\n<h2>Ideias pr\u00e9vias para a obten\u00e7\u00e3o da equa\u00e7\u00e3o das par\u00e1bolas<\/h2>\n<p>   <a name=\"2\"><\/a><\/p>\n<h3>No\u00e7\u00e3o geom\u00e9trica das par\u00e1bolas<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=130s\" target=\"_blank\" rel=\"noopener\"><strong>Uma par\u00e1bola \u00e9 a curva <\/strong><\/a>que se obt\u00e9m como a cole\u00e7\u00e3o de todos os pontos equidistantes de um ponto fixo, chamado foco, e uma linha fixa chamada diretriz. Para entender essa defini\u00e7\u00e3o e poder transform\u00e1-la em uma express\u00e3o alg\u00e9brica que possamos manipular, a equa\u00e7\u00e3o das par\u00e1bolas, precisamos primeiro revisar alguns conceitos pr\u00e9vios.<\/p>\n<p>   <a name=\"3\"><\/a><\/p>\n<h3>Dist\u00e2ncia entre dois pontos do plano cartesiano<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=199s\" target=\"_blank\" rel=\"noopener\"><strong>Consideremos dois pontos<\/strong><\/a> <span class=\"katex-eq\" data-katex-display=\"false\">p_1 = (x_1, y_1)<\/span> e <span class=\"katex-eq\" data-katex-display=\"false\">p_2 = (x_2, y_2).<\/span> A dist\u00e2ncia entre esses pontos \u00e9 o comprimento do segmento de reta que os une.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-Nm00_Mr0PJE\/YIH_4rGiO0I\/AAAAAAAAE-s\/gLJ6gjIGUuwsDhwVt6pa3MDZ0YQXEgJVgCLcBGAsYHQ\/s0\/distancia.PNG\" alt=\"Dist\u00e2ncia entre pontos\" class=\"aligncenter lazyload\" width=\"409\" height=\"263\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-Nm00_Mr0PJE\/YIH_4rGiO0I\/AAAAAAAAE-s\/gLJ6gjIGUuwsDhwVt6pa3MDZ0YQXEgJVgCLcBGAsYHQ\/s0\/distancia.PNG\" alt=\"Dist\u00e2ncia entre pontos\" class=\"aligncenter lazyload\" width=\"409\" height=\"263\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">Essa dist\u00e2ncia podemos medir atrav\u00e9s do <a href=\"https:\/\/youtu.be\/grjSzVl8Acw?t=553\" target=\"_blank\" rel=\"noopener\">teorema de pit\u00e1goras<\/a> fazendo a seguinte figura.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-xOGFNRBeUU0\/YIIAohgMqNI\/AAAAAAAAE-0\/LCiSnSMHVwMpTGOnTchVFtkVL0izESn3ACLcBGAsYHQ\/s0\/teorema%2Bde%2Bpitagoras.PNG\" alt=\"Teorema de Pit\u00e1goras\" class=\" aligncenter lazyload\" width=\"404\" height=\"255\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-xOGFNRBeUU0\/YIIAohgMqNI\/AAAAAAAAE-0\/LCiSnSMHVwMpTGOnTchVFtkVL0izESn3ACLcBGAsYHQ\/s0\/teorema%2Bde%2Bpitagoras.PNG\" alt=\"Teorema de Pit\u00e1goras\" class=\" aligncenter lazyload\" width=\"404\" height=\"255\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">Assim, a dist\u00e2ncia <span class=\"katex-eq\" data-katex-display=\"false\">d<\/span> entre os dois pontos ser\u00e1:<\/p>\n<p style=\"text-align: center;\"><span class=\"katex-eq\" data-katex-display=\"false\">d= \\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}<\/span>\n<p>   <a name=\"4\"><\/a><\/p>\n<h3>Transla\u00e7\u00e3o de Gr\u00e1ficos<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=390s\" target=\"_blank\" rel=\"noopener\"><strong>Consideremos uma fun\u00e7\u00e3o <\/strong><\/a><span class=\"katex-eq\" data-katex-display=\"false\">y(x) = x^2<\/span>. Se desenharmos isso, teremos algo como o que \u00e9 mostrado na figura.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-hf1AvDmNoYc\/YIIhv8_zkjI\/AAAAAAAAE_E\/kedKQoFwJSIkoIZgev9cQS--frmDbwTOwCLcBGAsYHQ\/s0\/traslacionDeGraficos1.PNG\" alt=\"Transla\u00e7\u00e3o de gr\u00e1ficos\" class=\" aligncenter lazyload\" width=\"325\" height=\"321\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-hf1AvDmNoYc\/YIIhv8_zkjI\/AAAAAAAAE_E\/kedKQoFwJSIkoIZgev9cQS--frmDbwTOwCLcBGAsYHQ\/s0\/traslacionDeGraficos1.PNG\" alt=\"Transla\u00e7\u00e3o de gr\u00e1ficos\" class=\" aligncenter lazyload\" width=\"325\" height=\"321\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">Se nesta fun\u00e7\u00e3o substituirmos <span class=\"katex-eq\" data-katex-display=\"false\">x<\/span> por <span class=\"katex-eq\" data-katex-display=\"false\">x-1<\/span> e <span class=\"katex-eq\" data-katex-display=\"false\">y<\/span> por <span class=\"katex-eq\" data-katex-display=\"false\">y-1,<\/span> ent\u00e3o observaremos a seguinte transforma\u00e7\u00e3o no gr\u00e1fico.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-TRHquCBRoB4\/YIIjbaFx5WI\/AAAAAAAAE_M\/ngYFLBH4y6AS4ywUaSwo2sscmAVT6viHgCLcBGAsYHQ\/s0\/traslacionDeGraficos2.PNG\" alt=\"Transla\u00e7\u00e3o de Gr\u00e1ficos\" class=\" aligncenter lazyload\" width=\"352\" height=\"288\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-TRHquCBRoB4\/YIIjbaFx5WI\/AAAAAAAAE_M\/ngYFLBH4y6AS4ywUaSwo2sscmAVT6viHgCLcBGAsYHQ\/s0\/traslacionDeGraficos2.PNG\" alt=\"Transla\u00e7\u00e3o de Gr\u00e1ficos\" class=\" aligncenter lazyload\" width=\"352\" height=\"288\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">Em geral, cada substitui\u00e7\u00e3o desse tipo produz uma transforma\u00e7\u00e3o de transla\u00e7\u00e3o, a saber:<\/p>\n<ul style=\"text-align: justify;\">\n<li><strong><span class=\"katex-eq\" data-katex-display=\"false\">x\\longmapsto x-a<\/span>:<\/strong> se <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> for positivo, move-se <span class=\"katex-eq\" data-katex-display=\"false\">a<\/span> unidades para a direita, se for negativo, move-se para a esquerda.<\/li>\n<li><strong><span class=\"katex-eq\" data-katex-display=\"false\">y\\longmapsto y-b<\/span>: <\/strong>se <span class=\"katex-eq\" data-katex-display=\"false\">b<\/span> for positivo, move-se <span class=\"katex-eq\" data-katex-display=\"false\">b<\/span> unidades para cima, se for negativo, move-se para baixo.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Essas s\u00e3o as transforma\u00e7\u00f5es de transla\u00e7\u00e3o e seu efeito em geral \u00e9 resumido na figura a seguir.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-anQa6JMVTyA\/YIIm1AgBVbI\/AAAAAAAAE_U\/7aKD9WSMVawEwJXOnpqpr-cskL-NxoPUgCLcBGAsYHQ\/s0\/traslacionDeGraficos3.PNG\" alt=\"Transla\u00e7\u00e3o geral de gr\u00e1ficos\" class=\"aligncenter lazyload\" width=\"522\" height=\"314\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-anQa6JMVTyA\/YIIm1AgBVbI\/AAAAAAAAE_U\/7aKD9WSMVawEwJXOnpqpr-cskL-NxoPUgCLcBGAsYHQ\/s0\/traslacionDeGraficos3.PNG\" alt=\"Transla\u00e7\u00e3o geral de gr\u00e1ficos\" class=\"aligncenter lazyload\" width=\"522\" height=\"314\" \/><\/noscript><br \/>\n   <a name=\"5\"><\/a><\/p>\n<h2>Defini\u00e7\u00e3o de Par\u00e1bola<\/h2>\n<p style=\"text-align: justify;\">Uma par\u00e1bola \u00e9 o conjunto de todos os pontos que s\u00e3o equidistantes a um ponto fixo e uma linha.<br \/>\n   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-16fe-qg141I\/YIH4NpKtc4I\/AAAAAAAAE-k\/ILLGwpB_IQQZbUBJvXOIl5HChpo8Noi_gCLcBGAsYHQ\/s0\/Parabola.PNG\" alt=\"Defini\u00e7\u00e3o de Par\u00e1bola\" class=\"aligncenter lazyload\" width=\"426\" height=\"302\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-16fe-qg141I\/YIH4NpKtc4I\/AAAAAAAAE-k\/ILLGwpB_IQQZbUBJvXOIl5HChpo8Noi_gCLcBGAsYHQ\/s0\/Parabola.PNG\" alt=\"Defini\u00e7\u00e3o de Par\u00e1bola\" class=\"aligncenter lazyload\" width=\"426\" height=\"302\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">O ponto fixo chama-se <strong>foco<\/strong>, e a linha \u00e9 a <strong>diretriz.<\/strong> Se prestarmos aten\u00e7\u00e3o, veremos que a no\u00e7\u00e3o de dist\u00e2ncia \u00e9 fundamental para definir as par\u00e1bolas, de modo que, para aprofundar sua an\u00e1lise, ser\u00e1 necess\u00e1rio revisar como se medem as dist\u00e2ncias no plano cartesiano e como se obt\u00eam alg\u00e9brica e geometricamente.<\/p>\n<p>   <a name=\"6\"><\/a><\/p>\n<h3>Dedu\u00e7\u00e3o da Equa\u00e7\u00e3o Fundamental das Par\u00e1bolas<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=604s\" target=\"_blank\" rel=\"noopener\"><strong>Por simplicidade, consideremos o ponto focal<\/strong><\/a> <span class=\"katex-eq\" data-katex-display=\"false\">p_f= (0,f)<\/span> e a diretriz como a linha <span class=\"katex-eq\" data-katex-display=\"false\">L<\/span> de equa\u00e7\u00e3o <span class=\"katex-eq\" data-katex-display=\"false\">y=-p<\/span>.<\/p>\n<p>   <img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/1.bp.blogspot.com\/-XfDceUwcaFM\/YIIZEUT6DrI\/AAAAAAAAE-8\/keal2s_uSooVvkKsa3Sw1roANTDH8592QCLcBGAsYHQ\/s0\/analisisParabola.PNG\" alt=\"A Equa\u00e7\u00e3o das Par\u00e1bolas\" class=\" aligncenter lazyload\" width=\"334\" height=\"249\" \/><noscript><img decoding=\"async\" src=\"https:\/\/1.bp.blogspot.com\/-XfDceUwcaFM\/YIIZEUT6DrI\/AAAAAAAAE-8\/keal2s_uSooVvkKsa3Sw1roANTDH8592QCLcBGAsYHQ\/s0\/analisisParabola.PNG\" alt=\"A Equa\u00e7\u00e3o das Par\u00e1bolas\" class=\" aligncenter lazyload\" width=\"334\" height=\"249\" \/><\/noscript><\/p>\n<p style=\"text-align: justify;\">Se tomarmos um ponto qualquer da par\u00e1bola com coordenadas <span class=\"katex-eq\" data-katex-display=\"false\">(x,y)<\/span>, ent\u00e3o ele ser\u00e1 equidistante tanto ao foco quanto \u00e0 diretriz. Podemos descrever isso algebricamente da seguinte forma:<\/p>\n<p style=\"text-align: center;\">Dist\u00e2ncia Foco-Ponto(x,y) <span class=\"katex-eq\" data-katex-display=\"false\">= \\sqrt{x^2 + (f-y)^2}= y+f =<\/span> Dist\u00e2ncia Ponto(x,y)-Diretriz.<\/p>\n<p style=\"text-align: justify;\">E a partir disso, desenvolve-se o seguinte racioc\u00ednio:<\/p>\n<table style=\"text-align: justify;\">\n<tbody>\n<tr>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(1)<\/span><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">\\sqrt{x^2 + (f-y)^2}= y+f<\/span><\/td>\n<td>; Dist\u00e2ncia ponto-foco = dist\u00e2ncia ponto-diretriz, Def. de par\u00e1bola<\/td>\n<\/tr>\n<tr>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(2)<\/span><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">x^2 + (f-y)^2= (y+f)^2<\/span><\/td>\n<td>; De  <span class=\"katex-eq\" data-katex-display=\"false\">(1)<\/span>, elevando ao quadrado<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">x^2 + \\cancel{f^2} - 2fy + \\cancel{y^2}= \\cancel{y^2} + 2fy + \\cancel{f^2}<\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">x^2 - 2fy = 2fy <\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">\\boxed{y=\\dfrac{x^2}{4f}}<\/span><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\">Isso \u00e9 o que chamamos de <strong>Equa\u00e7\u00e3o Fundamental das Par\u00e1bolas.<\/strong><\/p>\n<p style=\"text-align: justify;\">Se prestarmos aten\u00e7\u00e3o a esta par\u00e1bola, veremos que existe um ponto dela com a propriedade de ser o mais pr\u00f3ximo do foco (ou equivalentemente da diretriz). Este ponto \u00e9 o que chamamos de <strong>v\u00e9rtice<\/strong> e, para este caso espec\u00edfico, tem coordenadas <span class=\"katex-eq\" data-katex-display=\"false\">(0,0)<\/span>; a dist\u00e2ncia entre o foco e o v\u00e9rtice \u00e9 o que chamamos de <strong>dist\u00e2ncia focal,<\/strong> e seu valor <span class=\"katex-eq\" data-katex-display=\"false\">f<\/span> pode ser qualquer n\u00famero real, exceto zero.<\/p>\n<p style=\"text-align: justify;\">Quando <span class=\"katex-eq\" data-katex-display=\"false\">f\\gt 0<\/span>, a par\u00e1bola se abre para cima, e se, pelo contr\u00e1rio, <span class=\"katex-eq\" data-katex-display=\"false\">f\\lt 0<\/span>, ent\u00e3o ela se abre para baixo. \u00c0 medida que fazemos <span class=\"katex-eq\" data-katex-display=\"false\">f\\to 0<\/span>, a par\u00e1bola se achatar\u00e1, mantendo o v\u00e9rtice em sua posi\u00e7\u00e3o, e a diretriz se aproximar\u00e1 do v\u00e9rtice, parecendo que a par\u00e1bola e a diretriz se fundem em uma \u00fanica linha; quando <span class=\"katex-eq\" data-katex-display=\"false\">f<\/span> se anula, o gr\u00e1fico desaparece, pois n\u00e3o existem divis\u00f5es por zero.<\/p>\n<p>   <a name=\"7\"><\/a><\/p>\n<h3>A Equa\u00e7\u00e3o Geral das Par\u00e1bolas<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=1007s\" target=\"_blank\" rel=\"noopener\"><strong>A partir da equa\u00e7\u00e3o fundamental das par\u00e1bolas<\/strong><\/a> e da transla\u00e7\u00e3o de gr\u00e1ficos, temos, como resultado da substitui\u00e7\u00e3o de <span class=\"katex-eq\" data-katex-display=\"false\">x\\longmapsto (x-h)<\/span> e <span class=\"katex-eq\" data-katex-display=\"false\">y\\longmapsto (y-k),<\/span>, a <strong>Equa\u00e7\u00e3o Geral das Par\u00e1bolas<\/strong> com v\u00e9rtice em <span class=\"katex-eq\" data-katex-display=\"false\">(h,k)<\/span>.<\/p>\n<p style=\"text-align: center;\"><span class=\"katex-eq\" data-katex-display=\"false\">(y-k) = \\dfrac{(x-h)^2}{4f}<\/span>\n<p>   <a name=\"8\"><\/a><\/p>\n<h3>Equa\u00e7\u00e3o Can\u00f4nica das Par\u00e1bolas e os Polin\u00f4mios de Segundo Grau<\/h3>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.youtube.com\/watch?v=O2EYxxK03jU&amp;t=1116s\" target=\"_blank\" rel=\"noopener\"><strong>Se desenvolvermos a equa\u00e7\u00e3o<\/strong><\/a> geral das par\u00e1bolas, obteremos o seguinte racioc\u00ednio:<\/p>\n<table style=\"text-align: justify;\">\n<tbody>\n<tr>\n<td>(1)<\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\">(y-k) = \\dfrac{(x-h)^2}{4f}<\/span><\/td>\n<td>; Equa\u00e7\u00e3o geral das par\u00e1bolas<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\"> 4f(y-k) = (x-h)^2<\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\"> 4fy-4fk = x^2 - 2hx + h^2<\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\"> 4fy = x^2 - 2hx + h^2 + 4fk<\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><span class=\"katex-eq\" data-katex-display=\"false\"> y = \\dfrac{1}{4f}x^2 - \\dfrac{h}{2f}x + \\dfrac{h^2 + 4fk}{4f}<\/span><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\">Se nesta equa\u00e7\u00e3o fizermos a substitui\u00e7\u00e3o <span class=\"katex-eq\" data-katex-display=\"false\">a=\\dfrac{1}{4f},<\/span> <span class=\"katex-eq\" data-katex-display=\"false\">b=-\\dfrac{2h}{4f}<\/span> e <span class=\"katex-eq\" data-katex-display=\"false\">c=\\dfrac{h^2 + 4fk}{4f},<\/span> ent\u00e3o a equa\u00e7\u00e3o geral das par\u00e1bolas transforma-se na equa\u00e7\u00e3o can\u00f4nica, que resulta ser justamente o <a href=\"https:\/\/toposuranos.com\/factorizacion-del-polinomio-cuadratico-y-2n-cuadratico\/\" rel=\"noopener\" target=\"_blank\">polin\u00f4mio de segundo grau<\/a>.<\/p>\n<p style=\"text-align: center;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\boxed{y=ax^2 + bx + c}<\/span>\n","protected":false},"excerpt":{"rendered":"<p>A Equa\u00e7\u00e3o das Par\u00e1bolas: Defini\u00e7\u00f5es e Propriedades Resumo: Esta aula explora a defini\u00e7\u00e3o e dedu\u00e7\u00e3o da equa\u00e7\u00e3o de uma par\u00e1bola, destacando sua origem como o conjunto de pontos equidistantes a um foco e uma diretriz. A partir desse conceito, revisam-se no\u00e7\u00f5es pr\u00e9vias como a dist\u00e2ncia entre pontos no plano cartesiano e a transla\u00e7\u00e3o de gr\u00e1ficos, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":28890,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":15,"footnotes":""},"categories":[587,571],"tags":[],"class_list":["post-28895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-algebra-e-geometria","category-matematica-pt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Equa\u00e7\u00e3o das Par\u00e1bolas: Defini\u00e7\u00f5es e Propriedades - toposuranos.com\/material<\/title>\n<meta name=\"description\" content=\"Nesta aula sobre a equa\u00e7\u00e3o das par\u00e1bolas, voc\u00ea aprender\u00e1 a deduzir a equa\u00e7\u00e3o fundamental e sua 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