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Factorisation by Common Factors

Factorise : 6...

Question

Factorise :

$63 a^{2} b^{2} - 7$

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Solution

$63 a^{2} b^{2} - 7 = 7 (9 a^{2} b^{2} - 1) = 7 {(3 a b)^{2} - (1)^{2}} = 7 (3 a b + 1) (3 a b - 1) A n s .$

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