Question
Answer
$$-12+8i-(7+4i)=4i-19$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-12+8i-(7+4i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-12+8i-7-4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4i-19\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7+4i \right) = -7-4i $$ |
| ② | Combine like terms: $$ \color{blue}{-12} + \color{red}{8i} \color{blue}{-7} \color{red}{-4i} = \color{red}{4i} \color{blue}{-19} $$ |
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