SOLUTION: Can someone please explain to me how to do this problem? (9x^2-xy+y^2)+ (-x^2-8xy+9y^2)

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Question 590909: Can someone please explain to me how to do this problem?
(9x^2-xy+y^2)+ (-x^2-8xy+9y^2)
Found 2 solutions by jim_thompson5910, rfer:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%289x%5E2-xy%2By%5E2%29%2B+%28-x%5E2-8xy%2B9y%5E2%29

9x%5E2-xy%2By%5E2-x%5E2-8xy%2B9y%5E2 Remove unneeded parenthesis

%289x%5E2-x%5E2%29%2B%28-xy-8xy%29%2B%28y%5E2%2B9y%5E2%29 Group like terms

8x%5E2-9xy%2B10y%5E2 Combine like terms

So %289x%5E2-xy%2By%5E2%29%2B+%28-x%5E2-8xy%2B9y%5E2%29 fully simplifies to 8x%5E2-9xy%2B10y%5E2
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Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
9x^2-xy+y^2-x^2-8xy+9y^2
8x^2-10xy+10y^2