Question

Expand : (4a-7b)2 it is square​

Answer 1

(a-b)^2 = a^2 + b^2 -2ab

So..

(4a-7b)^2 = (4a)^2 + (7b)^2 - 2(4a)(7b)

                = 16 a^2 + 49 b^2 - 56ab

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