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