Factorise: a^2 b^2-6 a b c+9 c^2 - Vidyadip

Question

Factorise: $a^2 b^2-6 a b c+9 c^2$

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Answer

$a^2 b^2-6 a b c+9 c^2$
$=(a b)^2-2 \times a b \times 3 c+(3 c)^2$
$=(a b-3 c)^2$

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