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<p> </p> <div align="center"> <table style="color: #ffcc00; border: 4px solid #003300; float: none; text-align: center; vertical-align: top; width: 400px; background-image: url('http://www.insmilaifontanals.cat/none'); background-color: #000066;" border="4" frame="void" rules="none"> <tbody> <tr> <td style="background-color: #003300; width: 480px;" valign="top"><span style="font-size: large; color: #ffff99;" data-mce-mark="1">Quadrat d'una suma/diferència</span></td> </tr> <tr> <td style="background-image: none; color: #000066; text-align: justify; vertical-align: top; border-style: none; background-color: #ffffcc;" valign="top" width="NaNpx"><br /> <div align="center"><span style="color: #000000; font-size: x-large;" data-mce-mark="1"><strong><em>«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨24px¨»«mrow»«msup»«mfenced»«mrow»«mi mathvariant=¨normal¨ mathcolor=¨#0000FF¨»a«/mi»«mo»+«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#FF0000¨»b«/mi»«/mrow»«/mfenced»«mn»2«/mn»«/msup»«mo»=«/mo»«msup»«mi mathvariant=¨normal¨ mathcolor=¨#0000FF¨»a«/mi»«mn»2«/mn»«/msup»«mo»+«/mo»«mn»2«/mn»«mo»§#183;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#0000FF¨»a«/mi»«mo»§#183;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#FF0000¨»b«/mi»«mo»+«/mo»«msup»«mi mathvariant=¨normal¨ mathcolor=¨#FF0000¨»b«/mi»«mn»2«/mn»«/msup»«/mrow»«/mstyle»«/math»</em></strong></span></div> <div align="center"> <div align="left"><span style="color: #000000; font-size: small;"><em>Exemple:<br /></em><strong><em>(<span style="color: #000000;">4x</span> + <span style="color: #000000;">9</span>)<sup>2</sup> = (<span style="color: #000000;">4x</span>)<sup>2</sup> + 2·<span style="color: #000000;">4x</span>·<span style="color: #000000;">9</span> + (<span style="color: #000000;">9</span>)<sup>2</sup> = 16x<sup>2 </sup>+ 72x + 81</em></strong></span><br /><span style="color: #000000; font-size: small;">Però si és una diferència: </span><br /><span style="font-size: small;"><span style="color: #000000;"><strong><em>(<span style="color: #000000;">4x</span> <span style="color: #ff0000;">–</span> <span style="color: #000000;">9</span>)<sup>2</sup> = </em></strong></span><span style="color: #000000;"><strong><em><span style="color: #000000;"><strong><em>(<span style="color: #000000;">4x</span> + <span style="color: #ff0000;">(-9)</span>)<sup>2</sup> =<sup> </sup></em></strong></span></em></strong></span><span style="color: #000000;"><strong><em> 16x<sup>2 </sup><span style="color: #ff0000;">–</span> 72x + 81</em></strong></span></span></div> </div> </td> </tr> </tbody> </table> </div> <p><br /><br /></p> <div style="text-align: center;"> </div>
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