Perform the Indicated Operations $[3 \mathrm{r}+(\mathrm{s}+6)][3 \mathrm{r}-(\mathrm{s}+6)]$ A) $9 r^{2}+s^{2}-12 s-36$ B) $9 r^{2}-s^{2}-6 s-36$

Multiple Choice

Perform the indicated operations.
- $[3 \mathrm{r}+(\mathrm{s}+6) ][3 \mathrm{r}-(\mathrm{s}+6) ]$

A) $9 r^{2}+s^{2}-12 s-36$
B) $9 r^{2}-s^{2}-6 s-36$
C) $9 r^{2}-s^{2}-12 s-36$
D) $9 r^{2}-s^{2}-13 s-36$