Question

ADD
(2x^2-7xy+y^2)+(-9x^2-4xy-y^2)+(x^2+xy-7y^2)

Answer 1

2x^2-9x^2+x^2+y^2-y^2-7y^2-7xy-4xy+xy
=-6x^2-7y^2-10xy
=-(6x^2+10xy+7y^2)

Answer 2

Thanks cause i have the same answer so I know im on the right track

Answer 3

welcm