Answer
$$2r^4+5r^2-(3r^4-4r^2)=-r^4+9r^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2r^4+5r^2-(3r^4-4r^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2r^4+5r^2-3r^4+4r^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-r^4+9r^2\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 3r^4-4r^2 \right) = -3r^4+4r^2 $$ |
| ② | Combine like terms: $$ \color{blue}{2r^4} + \color{red}{5r^2} \color{blue}{-3r^4} + \color{red}{4r^2} = \color{blue}{-r^4} + \color{red}{9r^2} $$ |
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