(x + y)2 + (x – y)2 = A) 2(x2 + y2 ) B) 4xy C) x2 + y2 D) 2xy – InterviewSolution

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1.

(x + y)2 + (x – y)2 = A) 2(x2 + y2 ) B) 4xy C) x2 + y2 D) 2xy

Answer»

Correct option is (A) 2(x² + y²)

\((x+y)^2+(x-y)^2\) \(=(x^2+y^2+2xy)+(x^2+y^2-2xy)\)

= \(2(x^2+y^2)\)

A) 2(x² + y² )

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