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Quadratic Equations

Factorise: 5...

Question

Factorise: $5 x^{2} - x - 4$

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Solution

$5 x^{2} - x - 4$
$= 5 x^{2} - 5 x + 4 x - 4$
$= 5 x (x - 1) + 4 (x - 1)$
$= (5 x + 4) (x - 1)$

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