Question
Answer
$$-5-4i-(7+8i)=-12i-12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-5-4i-(7+8i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5-4i-7-8i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-12i-12\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7+8i \right) = -7-8i $$ |
| ② | Combine like terms: $$ \color{blue}{-5} \color{red}{-4i} \color{blue}{-7} \color{red}{-8i} = \color{red}{-12i} \color{blue}{-12} $$ |
This page was created using
Complex Expression calculator