Answer
$$8+7i-(9i+5)=-2i+3$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8+7i-(9i+5)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8+7i-9i-5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-2i+3\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 9i+5 \right) = -9i-5 $$ |
| ② | Combine like terms: $$ \color{blue}{8} + \color{red}{7i} \color{red}{-9i} \color{blue}{-5} = \color{red}{-2i} + \color{blue}{3} $$ |
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