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

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) (Show Source): You can put this solution on YOUR website!

Remove unneeded parenthesis

Group like terms

Combine like terms

So fully simplifies to
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Answer by rfer(16322) (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
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