Solve :
$x^{2} + 9 x + 20 = 0$

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Solution

given, $x^{2} + 9 x + 20 = 0$

$x^{2} + 5 x + 4 x + 20 = 0$

$x (x + 5) + 4 (x + 5) = 0$

$(x + 5) (x + 4) = 0$

$x = - 5, - 4$

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