Question 206905
<pre><font size = 4 color = "indigo"><b>

     x = 9;     x = 9

 x - 9 = 0; x - 9 = 0

   (x - 9)(x - 9) = 0

x<sup>2</sup> - 9x - 9x + 81 = 0 

    x<sup>2</sup> - 18x + 81 = 0

Edwin</pre>