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