$$ \begin{aligned}26x^4-9+3x-17x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}26x^4-17x^2+3x-9\end{aligned} $$ | |
① | Combine like terms: $$ 26x^4-17x^2+3x-9 = 26x^4-17x^2+3x-9 $$ |