Question
Answer
$$-4(20i+10)=-80i-40$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-4(20i+10)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(80i+40) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-80i-40\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4} $ by $ \left( 20i+10\right) $ $$ \color{blue}{4} \cdot \left( 20i+10\right) = 80i+40 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(80i+40 \right) = -80i-40 $$ |
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