Question

factorise this 81-49x²

Answer 1

$81 - 49 {x }^{2} = {9}^{2} - {7x}^{2} \\ using {a}^{2} - {b}^{2} = (a - b)(a + b) \\ (9 - 7x)(9 + 7x)$
hope you got the answer

Answer 2

Heya mate, Here is ur answer

81-49x^2

=(9)^2 -(7x)^2

Using identity a^2-b^2 =( a+b)(a-b)

=(9+7x)(9-7x)

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@Laughterqueen

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