Question
Answer
$$12-6i-(7+3i)=-9i+5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}12-6i-(7+3i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12-6i-7-3i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9i+5\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7+3i \right) = -7-3i $$ |
| ② | Combine like terms: $$ \color{blue}{12} \color{red}{-6i} \color{blue}{-7} \color{red}{-3i} = \color{red}{-9i} + \color{blue}{5} $$ |
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