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 <question type="category"><category><text>1MA 03. NOMBRES COMPLEXOS/1MA.03.1 Unitat i, EqG2 en ℂ</text></category></question>
 
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      <text>1MA.03.1.60DT POTÈNCIES DE i</text>
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<td style="width: 100%; background-color: #003300;" valign="top"><span style="color: #ffff99; font-size: large;" data-mce-mark="1">Potències de i</span></td>
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<td valign="top" width="100%"><span style="color: #003300;"><span style="font-weight: bold; font-size: small;" data-mce-mark="1">Com que:</span> <span style="font-size: large;" data-mce-mark="1"> <span style="font-weight: bold;" data-mce-mark="1">i = i; i</span><sup style="font-weight: bold; color: #006600;">2</sup><span style="font-weight: bold;" data-mce-mark="1"> = -1; i</span><sup style="font-weight: bold; color: #006600;">3</sup><span style="font-weight: bold;" data-mce-mark="1"> = -i; i</span><sup style="font-weight: bold; color: #006600;">4</sup><span style="font-weight: bold;" data-mce-mark="1"> = 1</span></span></span>
<p style="color: #006600; font-weight: bold; text-align: justify;"><span style="font-size: small; color: #003300;" data-mce-mark="1">per calcular les potències de i, cal fer la divisió entera de l'exponent per 4 i fixar-se en el residu r:</span></p>
<p style="color: #006600;"><em><span style="font-size: small; color: #003300;" data-mce-mark="1"><span style="text-decoration: underline;" data-mce-mark="1">Exemple 1</span>: i<sup>26</sup>. 26:4 → 26 = 4·6 +2 (residu 2):</span></em></p>
<p style="direction: ltr; margin-left: 40px; text-align: center;"><em><span style="color: #003300; font-size: small;" data-mce-mark="1"> i<sup>26</sup> = (i<sup>4</sup>)<sup>6</sup> · i<sup>2</sup> = 1 · i<sup>2</sup> = -1<br /></span></em></p>
<p style="direction: ltr; text-align: justify;"><em><span style="color: #003300; font-size: small;"><span style="font-size: small;">Exemple 2</span>: i<sup>39</sup>:    39 = 4·9 + 3 =&gt; i<sup>39</sup> = (i<sup>4</sup>)<sup>9</sup> ·i<sup>3</sup> = 1·i<sup>3</sup> = -i.</span></em></p>
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