Question
Answer
$$9-7i-(4i+15)=-11i-6$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}9-7i-(4i+15)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9-7i-4i-15 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-11i-6\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 4i+15 \right) = -4i-15 $$ |
| ② | Combine like terms: $$ \color{blue}{9} \color{red}{-7i} \color{red}{-4i} \color{blue}{-15} = \color{red}{-11i} \color{blue}{-6} $$ |
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