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 <question type="category"><category><text>1rBTX 03. EQUACIONS I INEQUACIONS/1.3.2 Equacions de 2n grau</text></category></question>
 
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      <text>1.3.2.30DT E2G3 CÀLCUL DE DELTA</text>
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      <text><![CDATA[<div align="left"> </div>
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<p><span style="font-size: small; color: #003300;"><span style="font-weight: bold;">El discriminant d'una equació de 2n grau, </span></span></p>
<p><span style="color: #003300;"><span style="font-size: small;"><span style="font-weight: bold;">ax</span><sup style="font-weight: bold;">2</sup></span><span style="font-weight: bold;"><span style="font-size: small;"> + bx + c = 0, es calcula amb:</span> </span></span><br style="font-weight: bold;" /><br style="font-weight: bold;" /></p>
<div style="text-align: center;"><span class="nolink">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi mathvariant=¨bold¨»§#916;«/mi»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«msup»«mi mathvariant=¨bold¨»b«/mi»«mn»2«/mn»«/msup»«mo»§nbsp;«/mo»«mo»-«/mo»«mo»§nbsp;«/mo»«mfenced close=¨]¨ open=¨[¨»«mrow»«mn»4«/mn»«mo»·«/mo»«mi mathvariant=¨bold¨»a«/mi»«mo»·«/mo»«mi mathvariant=¨bold¨»c«/mi»«/mrow»«/mfenced»«/math»</span></div>
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<div style="text-align: justify;"><span style="font-size: small; color: #003300;"><span style="font-size: medium;"><span style="font-weight: bold;">b</span><sup style="font-weight: bold;">2</sup></span><span style="font-weight: bold;"><span style="font-size: medium;"> és</span> <span style="text-decoration: underline; font-size: medium;">sempre positiu</span>. </span></span><br style="font-weight: bold;" /><span style="font-weight: bold; font-size: small; color: #003300;">Cal prestar atenció:</span><br style="font-weight: bold;" />
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<li style="font-weight: bold;"><span style="font-size: small;"><span style="color: #ff6600; text-decoration: underline;">als signes</span> <span style="color: #003300;">de a i c (pel signe de 4·a·c)</span></span></li>
<li><span style="font-weight: bold; font-size: small;"><span style="color: #003300;"> al fet que 4·a·c s'ha de</span> <span style="color: #ff6600; text-decoration: underline;">restar</span></span></li>
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