Question
Answer
$$-4i-(7+5i)=-9i-7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-4i-(7+5i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-4i-7-5i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9i-7\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 7+5i \right) = -7-5i $$ |
| ② | Combine like terms: $$ \color{blue}{-4i} -7 \color{blue}{-5i} = \color{blue}{-9i} -7 $$ |
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