Question
Answer
$$-10(13i-9)=-130i+90$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-10(13i-9)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(130i-90) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-130i+90\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{10} $ by $ \left( 13i-9\right) $ $$ \color{blue}{10} \cdot \left( 13i-9\right) = 130i-90 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(130i-90 \right) = -130i+90 $$ |
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