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Expansion of (x^2 - y^2)

Factorize: 4...

Question

Factorize:
$(49 b^{2} - 126 b + 81)$ .

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Solution

$49 b^{2} - 126 b + 81$
$(7 b^{2}) - 2 (7 b) (9) + 9^{2}$
$= (7 b - 9)^{2}$

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