SOLUTION: if (x-y)^2=50 and xy=7, what is the value of x^2+y^2?

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Question 900619: if (x-y)^2=50 and xy=7, what is the value of x^2+y^2?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
(x-y)^2=50 and xy=7, what is the value of x^2+y^2?
x^2+y^2 =x^2+y^2-2xy +2xy
=(x-y)^2+2xy
plug (x-y)^2 & xy
50+2*7
64