Answer
$$-9-7i+7+8i=i-2$$
Explanation
| $$ \begin{aligned}-9-7i+7+8i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}i-2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-9} \color{red}{-7i} + \color{blue}{7} + \color{red}{8i} = \color{red}{i} \color{blue}{-2} $$ |
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