Question
Answer
$$-8-7i-(7+2i)=-9i-15$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-8-7i-(7+2i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-8-7i-7-2i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9i-15\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7+2i \right) = -7-2i $$ |
| ② | Combine like terms: $$ \color{blue}{-8} \color{red}{-7i} \color{blue}{-7} \color{red}{-2i} = \color{red}{-9i} \color{blue}{-15} $$ |
This page was created using
Complex Expression calculator