Question
Answer
$$-(-9+9i)+5i=-4i+9$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-(-9+9i)+5i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9-9i+5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-4i+9\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left(-9+9i \right) = 9-9i $$ |
| ② | Combine like terms: $$ 9 \color{blue}{-9i} + \color{blue}{5i} = \color{blue}{-4i} +9 $$ |
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