ini caranya bagaimana?

<p>Jawaban : 6</p><p>&nbsp;</p><p>Ingat kembali:</p><ul><li>^alog b - ^alog c = ^alog (b/c)</li><li>^alog f(x) = ^alog g(x) ---------&gt; f(x) = g(x)</li><li>beda barisan aritmatika --&gt; b = Un - U(n-1)</li></ul><p>&nbsp;</p><p>Diketahui :&nbsp;</p><p>^alog (x - 2), ^alog (x + 2), ^alog (x + 10) membentuk barisan aritmatika</p><p>&nbsp;</p><p>Maka:</p><p>U2 - U1 = U3 - U2</p><p>^alog (x + 2) - ^alog (x - 2) = ^alog (x + 10) - ^alog (x + 2)</p><p>^alog [(x + 2)/(x - 2)] = ^alog [(x + 10)/(x + 2)]</p><p>(x + 2)/(x - 2) = (x + 10)/(x + 2)</p><p>(x + 2)(x + 2) = (x + 10)(x - 2)</p><p>x² + 2x + 2x + 4 = x² - 2x + 10x - 20</p><p>x² + 4x + 4 = x² + 8x - 20</p><p>x² + 4x - x² - 8x = -20 - 4</p><p>-4x = -24</p><p>x = (-24) / (-4)</p><p>x = 6</p><p>&nbsp;</p><p>Jadi, nilai x adalah 6.</p>