9a² $-$ 18ab $-$ 4ab² + 8b³

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Solution

$We have 9 a^{2} - 18 a b - 4 a b^{2} + 8 b^{3} = 9 a (a - 2 b) - 4 b^{2} (a - 2 b) = (a - 2 b) (9 a - 4 b^{2})$

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Factorise:
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