Multiply the Conjugates $(-3+3 \mathrm{i})(-3-3 \mathrm{i})$ A) 18
B) 0
C) 21
D) 19

Multiply the conjugates.
- $(-3+3 \mathrm{i}) (-3-3 \mathrm{i})$

A) 18
B) 0
C) 21
D) 19