Question

How to do 63a2 - 112b2. Factorise

Answer 1

The factor of $63a^2-112b^2$ is 7(3a+4b)(3a-4b)

Step-by-step explanation:

Given: $63a^2-112b^2$

Take out common factor of 63 and 112

$\Rightarrow 7(9a^2-16b^2)$

$\Rightarrow 7[(3a)^2-(4b)^2]$

Identity: $x^2-y^2=(x-y)(x+y)$

$\Rightarrow 7(3a+4b)(3a-4b)$

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