Answer
$$-90-27i-(66+34i)=-61i-156$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-90-27i-(66+34i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-90-27i-66-34i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-61i-156\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 66+34i \right) = -66-34i $$ |
| ② | Combine like terms: $$ \color{blue}{-90} \color{red}{-27i} \color{blue}{-66} \color{red}{-34i} = \color{red}{-61i} \color{blue}{-156} $$ |
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