Answer
$$5r^4-8r^2+2r^3-5r^2+2r^3+6r^4=11r^4+4r^3-13r^2$$
Explanation
| $$ \begin{aligned}5r^4-8r^2+2r^3-5r^2+2r^3+6r^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}11r^4+4r^3-13r^2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{5r^4} \color{red}{-8r^2} + \color{green}{2r^3} \color{red}{-5r^2} + \color{green}{2r^3} + \color{blue}{6r^4} = \color{blue}{11r^4} + \color{green}{4r^3} \color{red}{-13r^2} $$ |
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