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 Question from rajesh, a student: Sir, I would like to discuss on question- -Find the value of variable X and Y, equations are X2+Y2+2XY=25 X2+Y2-2XY=1 Sir, my point is equation looks not so easy.My opinion is there many (more than 4)value possible for both X and Y. Kindly help me. Waiting for your response. regards, rajesh

Rajesh,

I can give you a hint to help you get started.

$x^2 + y^2 + 2xy = (x + y)^2$

Penny

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