If x^2 - y^2 = 2xy, then (x+y)^2 =	Choose the correct answer
A) 2x^2  B) 3x^2  C) 4xy  D) 2y^2  E) -y^2
Its B   x^2 -y^2 = 2xy   x^2 = 2xy + y^2   2x^2dd x^2 on both sides we get   x^2 +x^2 = x^2 +y^2 +2xy   2x^2 = (x+y)^2   Correct Option : 2x^2
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If x^2 - y^2 = 2xy, then (x+y)^2 =