Answer
$$5x^4+2x+4x^2+3x^2-8x-x^2=5x^4+6x^2-6x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5x^4+2x+4x^2+3x^2-8x-x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5x^4+2x+4x^2+2x^2-8x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}5x^4+6x^2-6x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} -8x \color{blue}{-x^2} = \color{blue}{2x^2} -8x $$ |
| ② | Combine like terms: $$ 5x^4+ \color{blue}{2x} + \color{red}{4x^2} + \color{red}{2x^2} \color{blue}{-8x} = 5x^4+ \color{red}{6x^2} \color{blue}{-6x} $$ |
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