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If (x -y)^2= 200 and x^2 + y^2= 50 what Is the value of xy?
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If (x -y)^2= 200 and x^2 + y^2= 50 what Is the value of xy?

User Typist
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(x-y)^(2)= x^(2) -2xy+ y^(2) \\ xy= (x^(2) +y^(2)-(x-y)^(2))/(2) = (50-200)/(2) = (-150)/(2) =-75
User ManzoorWani
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