Question
Answer
$$-7-5i-(3-8i)=3i-10$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-7-5i-(3-8i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-7-5i-3+8i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3i-10\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 3-8i \right) = -3+8i $$ |
| ② | Combine like terms: $$ \color{blue}{-7} \color{red}{-5i} \color{blue}{-3} + \color{red}{8i} = \color{red}{3i} \color{blue}{-10} $$ |
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