| $$ \begin{aligned}1-3i-4-8i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-11i-3\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{1} \color{red}{-3i} \color{blue}{-4} \color{red}{-8i} = \color{red}{-11i} \color{blue}{-3} $$ |