Multiply Write the Result in the Form a + Bi $( 3 + i \sqrt { 3 } ) ( 3 - i \sqrt { 3 } )$

Multiple Choice

Multiply. Write the result in the form a + bi.
-( $( 3 + i \sqrt { 3 } ) ( 3 - i \sqrt { 3 } )$

A) 18
B) 12
C) 6
D) $9 + 3 \mathrm { i }$