Solve:
$4 a^{2} b^{2} - 12 a b c + 9 c^{2}$

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Solution

$4 a^{2} b^{2} - 12 a b c + 9 c^{2}$

$= {(2 a b)}^{2} - 2 \cdot 2 a b \cdot 3 c + {(3 c)}^{2}$

$= {(2 a b - 3 c)}^{2} (∵ {(x - y)}^{2} = x^{2} - 2 x y + y^{2})$

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