| $$ \begin{aligned}\frac{x^2+5x+6}{x^2+14+24}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{x^2+5x+6}{x^2+38}\end{aligned} $$ | |
| ① | Simplify denominator $$ x^2+ \color{blue}{14} + \color{blue}{24} = x^2+ \color{blue}{38} $$ |