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Quadratic Formula

Factorise: x...

Question

Factorise:
$x^{2} - x - 12$

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Solution

$= x^{2} - x - 12$
$= x^{2} - 4 x + 3 x - 12$
$= x (x - 4) + 3 (x - 4)$
$= (x + 3) (x - 4)$

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