Multiply. Write your answer in a +bi form.
-$4 \mathrm{i}(8-9 \mathrm{i})$
A) $32 i-36 i^{2}$
B) $36+32 \mathrm{i}$
C) $32 \mathrm{i}-36$
D) $32 i+36 i^{2}$

Name: Multiply. Write your answer in a +bi form. -$4 \mathrm{i}(8-9 \mathrm{i})$ A) $32 i-36 i^{2}$ B) $36+32 \mathrm{i}$ C) $32 \mathrm{i}-36$ D) $32 i+36 i^{2}$
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Question

Quizplus · Accepted Answer

Multiplying $4i$ by $8-9i$ gives $32i - 36i^2$. Since $i^2 = -1$, $32i - 36(-1) = 32i + 36$, which is in the form $a + bi$.

Multiply Write Your Answer in a +Bi Form 4i(8−9i)4 \mathrm{i}(8-9 \mathrm{i})4i(8−9i)

Multiply Write Your Answer in a +Bi Form $4 \mathrm{i}(8-9 \mathrm{i})$