| $$ \begin{aligned}2x^2-4x^4+10x^4-11x^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6x^4-11x^3+2x^2\end{aligned} $$ | |
| ① | Combine like terms: $$ 2x^2 \color{blue}{-4x^4} + \color{blue}{10x^4} -11x^3 = \color{blue}{6x^4} -11x^3+2x^2 $$ |