Question

please solve this value​

Answer 1

Identities used :

$(x + y)(x - y) = {x}^{2} - {y}^{2} \\ \\ {(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy \\ \\ {(x - y)}^{2} = {x}^{2} + {y}^{2} - 2xy$

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