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

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Solution

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

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Factorise:

$9 x^{2} + 3 x - 8 y - 64 y^{2}$

9 x^{2} + 49 x + 20

Factorise: 9 x^{2} - 24 x + 16

Factorise $9 x^{2} - 64$

9 x^{2} + 24 x y + 16 y^{2}

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