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OpenStudy (anonymous):
add (5x^2-5xy+y^2)+(-9x^2-3xy-y^2)+(x^2+xy-8y^2)
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OpenStudy (anonymous):
Just remove the parentheses. They're of no use here. 5x^2 - 5xy + y^2 - 9x^2 - 3xy - y^2 + x^2 + xy - 8y^2 Just combine like terms.
OpenStudy (anonymous):
is it -3x^2-7xy-8y^2
OpenStudy (anonymous):
Yup :)
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