Question
Solve:
$9 a^2-24 a b+16 b^2$

Answer

$9 a^2-24 a b+16 b^2$
$=(3 a)^2-2 \times 3 a \times 4 b+(4 b)^2$
$=(3 a-4 b)^2$
$=(3 a-4 b)(3 a-4 b)$

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