Add or subtract as indicated. Write your answer in the form $a+b i$.
-$[(2+6 \mathrm{i})-(10+10 \mathrm{i})]-(3-7 \mathrm{i})$
A) $15+9 i$
B) $15+3 \mathrm{i}$
C) $-11+3 \mathrm{i}$
D) $-11+9 i$

Question

Quizplus · Accepted Answer

First, simplify the expression inside the brackets: $(2+6i)-(10+10i) = -8-4i$. Then subtract $(3-7i)$ from this result: $(-8-4i)-(3-7i) = -8-4i-3+7i = -11+3i$.

Add or Subtract as Indicated a+bia+b ia+bi - [(2+6i)−(10+10i)]−(3−7i)[(2+6 \mathrm{i})-(10+10 \mathrm{i})]-(3-7 \mathrm{i})[(2+6i)−(10+10i)]−(3−7i)

Add or Subtract as Indicated $a+b i$
- $[(2+6 \mathrm{i})-(10+10 \mathrm{i})]-(3-7 \mathrm{i})$