Add.
-$\left(3 x^{2}-2 x y+y^{2}\right)+\left(3 x^{2}+4 x y-y^{2}\right)+\left(x^{2}+x y-y^{2}\right)$
A) $7 x^{2}+3 x y+y^{2}$
B) $5 x^{2}+1 x y-y^{2}$
C) $6 x^{2}+2 x y-y^{2}$
D) $7 x^{2}+3 x y-y^{2}$

Question

Quizplus · Accepted Answer

To solve, combine like terms: $3x^2 + 3x^2 + x^2 = 7x^2$, $-2xy + 4xy + xy = 3xy$, and $y^2 - y^2 - y^2 = -y^2$. This gives $7x^2 + 3xy - y^2$.

Add - (3x2−2xy+y2)+(3x2+4xy−y2)+(x2+xy−y2)\left(3 x^{2}-2 x y+y^{2}\right)+\left(3 x^{2}+4 x y-y^{2}\right)+\left(x^{2}+x y-y^{2}\right)(3x2−2xy+y2)+(3x2+4xy−y2)+(x2+xy−y2) A) 7x2+3xy+y27 x^{2}+3 x y+y^{2}7x2+3xy+y2

Add
- $\left(3 x^{2}-2 x y+y^{2}\right)+\left(3 x^{2}+4 x y-y^{2}\right)+\left(x^{2}+x y-y^{2}\right)$ A) $7 x^{2}+3 x y+y^{2}$