The correct option is 81 49x^2=(9)^2 (7x)^2=(9+7x)(9 7x) {∵ a^2 b^2=(a+b)(a b) } ...

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Factorisation Using Algebraic Identities

Factorise : 8...

Question

Factorise :

$81 - 49 x^{2}$

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Solution

$81 - 49 x^{2} = (9)^{2} - (7 x)^{2} = (9 + 7 x) (9 - 7 x) {∵ a^{2} - b^{2} = (a + b) (a - b)}$

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