Factorise:
$8 a b^{2} - 18 a^{3}$

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Solution

$8 a b^{2} - 18 a^{3} \Rightarrow 2 a (4 b^{2} - 9 a^{2}) \Rightarrow 2 a (2 b - 3 a) (2 b + 3 a)$

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