Question
Answer
$$8-12i-(5+4i)=-16i+3$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8-12i-(5+4i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8-12i-5-4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-16i+3\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 5+4i \right) = -5-4i $$ |
| ② | Combine like terms: $$ \color{blue}{8} \color{red}{-12i} \color{blue}{-5} \color{red}{-4i} = \color{red}{-16i} + \color{blue}{3} $$ |
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