Q : 2         Find the product.

                (ii) \small (x+7y)(7x-y)

Answers (1)

(x + 7y) X (7x - y) =  (x)(7x) + (x)(-y) + (7y)(7x) + (7y)(-y)
                             = 7x^{2} - xy + 49xy - 7y^{2}
                             =  7x^{2} + 48xy - 7y^{2}

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