Question
Answer
$$-7-8i-(2-2i)=-6i-9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-7-8i-(2-2i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-7-8i-2+2i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-6i-9\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 2-2i \right) = -2+2i $$ |
| ② | Combine like terms: $$ \color{blue}{-7} \color{red}{-8i} \color{blue}{-2} + \color{red}{2i} = \color{red}{-6i} \color{blue}{-9} $$ |
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