$$ \begin{aligned}med+mefx+lax^2+lbx+c& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}alx^2+efmx+blx+dem+c\end{aligned} $$ | |
① | Combine like terms: $$ alx^2+efmx+blx+dem+c = alx^2+efmx+blx+dem+c $$ |