SOLUTION: If (x-y)^2 = 71 and x^2 + y^2 = 59, what is the value of xy?

SOLUTION: If (x-y)^2 = 71 and x^2 + y^2 = 59, what is the value of xy?

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Question 1087016: If (x-y)^2 = 71 and x^2 + y^2 = 59, what is the value of xy?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

 = 71 =  =  -  = 59 - 2xy  ====+

-2xy = 71 - 59 = 12  ====>  xy =  = -6.

Solved.

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