Answer
$$8r^4-6r-(5r+4r^4)=4r^4-11r$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8r^4-6r-(5r+4r^4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8r^4-6r-5r-4r^4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4r^4-11r\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 5r+4r^4 \right) = -5r-4r^4 $$ |
| ② | Combine like terms: $$ \color{blue}{8r^4} \color{red}{-6r} \color{red}{-5r} \color{blue}{-4r^4} = \color{blue}{4r^4} \color{red}{-11r} $$ |
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