Multiply. Write your answer in a + bi form.
-$7 \mathrm { i } ( 8 - 8 \mathrm { i } )$
A) $56 i + 56 i ^ { 2 }$
B) $56 + 56 \mathrm { i }$
C) $56 \mathrm { i } - 56 \mathrm { i } ^ { 2 }$
D) $56 \mathrm { i } - 56$

Question

Quizplus · Accepted Answer

Use the distributive property to simplify: 
$$7i(8-8i)=56i-56i^2$$
Since $i^2$ is equal to $-1$, we can substitute $-1$ in for $i^2$: 
$$56i-56i^2=56i-56(-1)=56i+56$$
Therefore, the answer is $56+56i$.

Multiply Write Your Answer in a + Bi Form 7i(8−8i)7 \mathrm { i } ( 8 - 8 \mathrm { i } )7i(8−8i)

Multiply Write Your Answer in a + Bi Form $7 \mathrm { i } ( 8 - 8 \mathrm { i } )$