{"id":11723,"date":"2014-01-30T16:39:03","date_gmt":"2014-01-30T16:39:03","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=11723"},"modified":"2022-01-14T18:46:08","modified_gmt":"2022-01-14T18:46:08","slug":"considere-as-funcoes-y_1-e-y_2","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=11723","title":{"rendered":"Considere as fun\u00e7\u00f5es ${y_1}$ e ${y_2}$"},"content":{"rendered":"<p><ul id='GTTabs_ul_11723' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_11723' class='GTTabs_curr'><a  id=\"11723_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_11723' ><a  id=\"11723_1\" onMouseOver=\"GTTabsShowLinks('Resolu\u00e7\u00e3o'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Resolu\u00e7\u00e3o<\/a><\/li>\n<\/ul>\n\n<div class='GTTabs_divs GTTabs_curr_div' id='GTTabs_0_11723'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<p>Considere as fun\u00e7\u00f5es \\[\\begin{array}{*{20}{c}}<br \/>\n{{y_1} = \\frac{{2x &#8211; 5}}{{x &#8211; 3}}}&amp;{\\text{e}}&amp;{{y_2} = \\frac{{x + 7}}{{3x + 2}}}<br \/>\n\\end{array}\\]<\/p>\n<ol>\n<li>Escreva as express\u00f5es anal\u00edticas de ${y_1}$ e ${y_2}$ na forma \\[y = a + \\frac{b}{{cx + d}}\\]<\/li>\n<li>Represente graficamente as fun\u00e7\u00f5es.<\/li>\n<li>Relacione o par\u00e2metro $a$ com as equa\u00e7\u00f5es das ass\u00edntotas do gr\u00e1fico da fun\u00e7\u00e3o.<\/li>\n<\/ol>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_11723' onClick='GTTabs_show(1,11723)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_11723'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<ol>\n<li>Tem-se sucessivamente:<br \/>\n\\[{y_1} = \\frac{{2x &#8211; 5}}{{x &#8211; 3}} = \\frac{{2\\left( {x &#8211; 3} \\right) + 1}}{{x &#8211; 3}} = \\frac{{2\\left( {x &#8211; 3} \\right)}}{{x &#8211; 3}} + \\frac{1}{{x &#8211; 3}} = \\boxed{2 + \\frac{1}{{x &#8211; 3}}}\\]<br \/>\n\\[{y_2} = \\frac{{x + 7}}{{3x + 2}} = \\frac{{x + \\frac{2}{3} + \\frac{{19}}{3}}}{{3\\left( {x + \\frac{2}{3}} \\right)}} = \\frac{{x + \\frac{2}{3}}}{{3\\left( {x + \\frac{2}{3}} \\right)}} + \\frac{{\\frac{{19}}{3}}}{{3\\left( {x + \\frac{2}{3}} \\right)}} = \\frac{1}{3} + \\frac{{\\frac{{19}}{3}}}{{3x + 2}} = \\boxed{\\frac{1}{3} + \\frac{{19}}{{9x + 6}}}\\]<br \/>\n\u00ad<\/li>\n<li>As fun\u00e7\u00f5es est\u00e3o representadas graficamente abaixo.<br \/>\n\u00ad<\/li>\n<li>Se\u00a0$x \\to\u00a0 \\pm \\infty $, ent\u00e3o $\\frac{b}{{cx + d}} \\to 0$ e, consequentemente, $y = a + \\frac{b}{{cx + d}} \\to a$.<br \/>\nLogo, a reta de equa\u00e7\u00e3o $y = a$ \u00e9 uma ass\u00edntota horizontal do gr\u00e1fico da fun\u00e7\u00e3o quando $x \\to\u00a0 &#8211; \\infty $ e quando $x \\to\u00a0 + \\infty $.<\/p>\n<p>Portanto, a equa\u00e7\u00e3o da ass\u00edntota horizontal\u00a0\u00c9 dependente do par\u00e2metro $a$.<\/p>\n<p>Se $x \\to\u00a0 &#8211; \\frac{d}{c}$ (com $c \\ne 0$), ent\u00e3o $\\frac{b}{{cx + d}} \\to \\infty $ e, consequentemente, $y = a + \\frac{b}{{cx + d}} \\to \\infty $.<br \/>\nLogo, a reta de equa\u00e7\u00e3o $x =\u00a0 &#8211; \\frac{d}{c}$ \u00e9 uma ass\u00edntota vertical bilateral do gr\u00e1fico da fun\u00e7\u00e3o.<\/p>\n<p>Portanto, a equa\u00e7\u00e3o da ass\u00edntota vertical N\u00c3O\u00a0\u00c9 dependente do par\u00e2metro $a$.<\/p>\n<\/li>\n<\/ol>\n<p>\u00ad<\/p>\n<p>Utilizando a anima\u00e7\u00e3o abaixo, explore a conclus\u00e3o exposta em 3., alterando os par\u00e2metros $a$, $b$, $c$ e $d$, depois de ativar a representa\u00e7\u00e3o da fun\u00e7\u00e3o $g$.<\/p>\n<p>Obtenha ainda a representa\u00e7\u00e3o das fun\u00e7\u00f5es ${y_1}$ e ${y_2}$, pela escolha adequada dos referidos par\u00e2metros.<\/p>\n<p 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is3D=is 3D applet using 3D view, AV=Algebra View, SV=Spreadsheet View, CV=CAS View, EV2=Graphics View 2, CP=Construction Protocol, PC=Probability Calculator, DA=Data Analysis, FI=Function Inspector, PV=Python, macro=Macro View\r\nvar views = {'is3D': 0,'AV': 0,'SV': 0,'CV': 0,'EV2': 0,'CP': 1,'PC': 0,'DA': 0,'FI': 0,'PV': 0,'macro': 0};\r\nvar applet = new GGBApplet(parameters, '5.0', views);\r\nwindow.onload = function() {applet.inject('ggbApplet')};\r\n<\/script><\/p>\n<div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_11723' onClick='GTTabs_show(0,11723)'>&lt;&lt; Enunciado<\/a><\/span><\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Enunciado Resolu\u00e7\u00e3o Enunciado Considere as fun\u00e7\u00f5es \\[\\begin{array}{*{20}{c}} {{y_1} = \\frac{{2x &#8211; 5}}{{x &#8211; 3}}}&amp;{\\text{e}}&amp;{{y_2} = \\frac{{x + 7}}{{3x + 2}}} \\end{array}\\] Escreva as express\u00f5es anal\u00edticas de ${y_1}$ e ${y_2}$ na forma \\[y = 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