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OpenStudy (anonymous):
(4x^2-7xy+y^2)+(-8x^2-9xy-y^2)+(x^2+xy-3y^2)
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OpenStudy (anonymous):
I got 3x^2-15xy-3y^2
OpenStudy (anonymous):
waned to know if that was right
OpenStudy (anonymous):
should be -3x^2 at the front
OpenStudy (anonymous):
the rest is correct
OpenStudy (anonymous):
thank you that was a typo
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OpenStudy (anonymous):
i make typos hourly
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