SOLUTION: Please help me solve (3x^2-2xy+y^2)+(-9x^2-9xy-y^2)+x^2+xy-5y^2)

Question 401740: Please help me solve
(3x^2-2xy+y^2)+(-9x^2-9xy-y^2)+x^2+xy-5y^2)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
(3x^2-2xy+y^2)+(-9x^2-9xy-y^2)+x^2+xy-5y^2)
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Gather like terms.
= (3x^2-9x^2+x^2)+(-2xy-9xy+xy)+(y^2-y^2-5y^2)
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= -5x^2-10xy-5y^2
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= -5(x^2+2xy+y^2)
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Factor:
= -5(x+y)^2
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Cheers,
Stan H.
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