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Factorisation by Common Factors

Factorise x...

Question

Factorise $x^{2} + x - 2$

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Solution

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

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