Question
Answer
$$80i-(80+10i)=70i-80$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}80i-(80+10i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}80i-80-10i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}70i-80\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 80+10i \right) = -80-10i $$ |
| ② | Combine like terms: $$ \color{blue}{80i} -80 \color{blue}{-10i} = \color{blue}{70i} -80 $$ |
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