Solve :
$x^{2} - 9 x - 10 = 0$

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Solution

$x^{2} - 9 x - 10 = 0$
$x^{2} - 10 x + x - 10 = 0$
$x (x - 10) + 1 (x - 10) = 0$
$(x - 10) (x + 1) = 0$
$x = 10, - 1$

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