$$ \begin{aligned}3x^2-5x^3-x+10-2x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-5x^3+x^2-x+10\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{3x^2} -5x^3-x+10 \color{blue}{-2x^2} = -5x^3+ \color{blue}{x^2} -x+10 $$ |