Question

x^2 - x - 72 = 0

Find the value of x

Answer 1

x^2 - x - 72 = 0
x^2 -9x +8x -72 =0
x(x-9) +8(x-9) =0
x-9 =0 and x+8 =0
x = 9. and x = -8
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Answer 2

$x {2} - x - 72 = 0$
$= > x {2} + 8x - 9x - 72 = 0$
$= > x(x + 8) - 9(x + 8) = 0$
$= > ( x + 8)(x + 9) = 0$
$= > x + 8 = 0$
$= > x - 9 = 0$
Therefore
$x = - 8$
$x = 9$