Find the product with suitable identity(7x-y)(49xsq+7xy+ysq)
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(7x - 9y) (7x - 9y)
= (7x - 9y)^2
Using identity [ (a-b)^2 = a^2 + b^2 - 2ab]
= (7x)^2 + (9y)^2 - 2(7x)(9y)
= 49x^2 + 81y^2 - 126xy
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