Question

add:
(3x^2-4xy+y^2)+(-8x^2-9xy-y^2)+(x^2+xy-2y^2)

Answer 1

-4 x^2-12 x y-2 y^2

Answer 2

( 3x^2 -4xy + y^2)+
(-8x^2 -9xy - y^2)+
( x^2 + xy -2y^2)
------------------
-4x^2 -12xy -2y^2

Answer 3

just combine like terms or similar terms