Question

Please prove that question is an identity.
(x + y)² - (x - y)² = 4xy
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Answer 1

Answer:

please refer the attachment

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(x+y)²= x²+2xy+y²

(x-y)² = x²-2xy+y²

LHS

=(x+y)²-(x-y)²

=(x²+2xy+y²)-(x²-2xy+y²)

=x²+2xy+y²-x²+2xy-y²

=4xy

RHS

=4xy

LHS=RHS