Question
Answer
$$3r+5r^4-(r-7r^4)=12r^4+2r$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3r+5r^4-(r-7r^4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3r+5r^4-r+7r^4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}12r^4+2r\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( r-7r^4 \right) = -r+7r^4 $$ |
| ② | Combine like terms: $$ \color{blue}{3r} + \color{red}{5r^4} \color{blue}{-r} + \color{red}{7r^4} = \color{red}{12r^4} + \color{blue}{2r} $$ |
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