Question
Answer
$$-(-7-i)-10i=-9i+7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-(-7-i)-10i& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7+i-10i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9i+7\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left(-7-i \right) = 7+i $$ |
| ② | Combine like terms: $$ 7+ \color{blue}{i} \color{blue}{-10i} = \color{blue}{-9i} +7 $$ |
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