Question
Answer
$$7+9i+(-5i)=4i+7$$
Explanation
| $$ \begin{aligned}7+9i+(-5i)& \xlongequal{ }7+9i-5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4i+7\end{aligned} $$ | |
| ① | Combine like terms: $$ 7+ \color{blue}{9i} \color{blue}{-5i} = \color{blue}{4i} +7 $$ |
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