Perform the Indicated Operation and Simplify $a + bi$ - $( 2 + 4 \mathrm { i } ) ( 2 - 4 \mathrm { i } )$

Multiple Choice

Perform the indicated operation and simplify. Write the result in the form a $a + bi$
- $( 2 + 4 \mathrm { i } ) ( 2 - 4 \mathrm { i } )$

A) $20 + 0 \mathrm { i }$
B) $4 - 16 i$
C) $- 12 + 0 \mathrm { i }$
D) $4 - 16 \mathrm { i } ^ { 2 }$