Answer
$$3+11i+10+9i=20i+13$$
Explanation
| $$ \begin{aligned}3+11i+10+9i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20i+13\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3} + \color{red}{11i} + \color{blue}{10} + \color{red}{9i} = \color{red}{20i} + \color{blue}{13} $$ |
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