Multiply
- $(7 y+x)(7 y-x)$ A) $49 y^{2}+14 x y-x^{2}$ B) $49 y^{2}-x^{2}$

Multiple Choice

Multiply.
- $(7 y+x) (7 y-x)$

A) $49 y^{2}+14 x y-x^{2}$
B) $49 y^{2}-x^{2}$
C) $14 y^{2}-x^{2}$
D) $49 y^{2}-14 x y-x^{2}$
E) $16 a^{2}+88 a c-121 c^{2}$