SOLUTION: add
(2x^2-7xy+y^2)+(-8x^2-4xy-y^2)+(x^2+xy-9y^2)
Algebra.Com
Question 476449: add
(2x^2-7xy+y^2)+(-8x^2-4xy-y^2)+(x^2+xy-9y^2)
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
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