Question

using suitable identity (7x-9y) (7x-9y)

Answer 1

$(a - b)(a - b) = {a}^{2} + {b}^{2} - 2ab \\ \\ (7x - 9y)(7x - 9y) \\ = {(7x)}^{2} + {(2y)}^{2} - 2(7x)(9y) \\ = 49 {x}^{2} + 81 {y}^{2} - 126xy$
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Answer 2

(7x-9y)^2
(7x)^2+(9y)^2-2 x 7x x 9y
49x^2+81^2 x 126xy......... answer
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