Question:
Factorize:
$8 a b^{2}-18 a^{3}$
Solution:
$8 a b^{2}-18 a^{3}=2 a\left(4 b^{2}-9 a^{2}\right)$
$=2 a\left[(2 b)^{2}-(3 a)^{2}\right]$
$=2 a(2 b-3 a)(2 b+3 a)$
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