SOLUTION: if x^2 + y^2 = 10 and (x - y)^2 = 2 find the numerical value of xy.

SOLUTION: if x^2 + y^2 = 10 and (x - y)^2 = 2 find the numerical value of xy.

Algebra.Com

Question 522992: if x^2 + y^2 = 10 and (x - y)^2 = 2 find the numerical value of xy.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
x^2 + y^2 = 10 -------------(1)
(x - y)^2 = 2
x^2+y^2-2xy =2---------------(2)
(1)-(2)
2xy=10-2
2xy=8
xy=4

xy.
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