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Taking Out Common Factors

Factorise : ...

Question

Factorise :
$3 x^{2} - x - 4$

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Solution

$3 x^{2} - x - 4 = 3 x^{2} - 4 x + 3 x - 4 = x (3 x - 4) + (3 x - 4) = (x + 1) (3 x - 4)$

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