Answer
$$-1-4i+8+4i=7$$
Explanation
| $$ \begin{aligned}-1-4i+8+4i& \xlongequal{ }-1 -\cancel{4i}+8+ \cancel{4i} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-1} \, \color{red}{ -\cancel{4i}} \,+ \color{blue}{8} + \, \color{red}{ \cancel{4i}} \, = \color{blue}{7} $$ |
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