SOLUTION: add (4x^2-2xy+y^2)+(-8x^2-6xy-y^2)+(x^2+xy-9y^2)

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Question 420343: add
(4x^2-2xy+y^2)+(-8x^2-6xy-y^2)+(x^2+xy-9y^2)
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

after addition : -3x^2 -7xy-9y^2