Factorise : 9x^2 - 3x - 20 - Vidyadip

Question

Factorise $: 9x^2 - 3x - 20$

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Answer

$9x^2 - 3x - 20$
$= 9x^2 - 15x + 12x - 20$
$= 3x(3x - 5) + 4(3x - 5)$
$= (3x - 5)(3x + 4)$

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