| $$ \begin{aligned}-8w^2y+4w^2y^4-w^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4w^2y^4-w^4-8w^2y\end{aligned} $$ | |
| ① | Combine like terms: $$ -8w^2y+4w^2y^4-w^4 = 4w^2y^4-w^4-8w^2y $$ |