$$ \begin{aligned}-6-4i+1+4i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{-6} \, \color{red}{ -\cancel{4i}} \,+ \color{blue}{1} + \, \color{red}{ \cancel{4i}} \, = \color{blue}{-5} $$ |