SOLUTION: If x^2+y^2=-2xy, what does the expression x^3 + 2y^3 equal?

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Question 807145: If x^2+y^2=-2xy, what does the expression x^3 + 2y^3 equal?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2%2By%5E2=-2xy
means

%28x%2By%29%5E2=0
means
x%2By=0.
Now