Answer
$$3-9i+2-4i=-13i+5$$
Explanation
| $$ \begin{aligned}3-9i+2-4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-13i+5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3} \color{red}{-9i} + \color{blue}{2} \color{red}{-4i} = \color{red}{-13i} + \color{blue}{5} $$ |
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