1.

Using a suitable identity (7x -9y) (7x -9y)

Answer»

The IDENTITY is
(a-b)^2 = a^2 - 2AB + b^2
(7X-9Y)^2
(7x)^2 - 2×7x×9y + (9y)^2
49x^2 - 126xy + 81y^2



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