Add
- $\left(5 x^{2}-2 x y+y^{2}\right)+\left(5 x^{2}-2 x y-y^{2}\right)+\left(x^{2}+x y-y^{2}\right)$ A) $10 x^{2}-4 x y-y^{2}$

Multiple Choice

Add.
- $\left(5 x^{2}-2 x y+y^{2}\right) +\left(5 x^{2}-2 x y-y^{2}\right) +\left(x^{2}+x y-y^{2}\right)$

A) $10 x^{2}-4 x y-y^{2}$
B) $9 x^{2}-5 x y-y^{2}$
C) $11 x^{2}-3 x y+y^{2}$
D) $11 x^{2}-3 x y-y^{2}$