SOLUTION: add
(4x^2-2xy+y^2)+(-8x^2-6xy-y^2)+(x^2+xy-9y^2)
Algebra.Com
Question 420343: add
(4x^2-2xy+y^2)+(-8x^2-6xy-y^2)+(x^2+xy-9y^2)
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!
after addition : -3x^2 -7xy-9y^2
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