Given 2x^2 -y^2 = 2xy
i.e y^2 = 2x^2 - 2xy
Expand (x+y) ^ 2 = x^2 + y ^2 + 2xy (1) [(a+b)^2 = a^2+b^2+2ab]
Substitute 2x^2 - 2xy for y^2 IN (1)
= x^2+2x^2-2xy+2xy (-2XY+2XY=0)
= 3x^2
B)
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