$$ \begin{aligned}\frac{m^2+9m-36}{m-3}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}m+12\end{aligned} $$ | |
① | Factor both the denominator and the numerator, then cancel the common factor. $\color{blue}{m-3}$. $$ \begin{aligned} \frac{m^2+9m-36}{m-3} & =\frac{ \left( m+12 \right) \cdot \color{blue}{ \left( m-3 \right) }}{ 1 \cdot \color{blue}{ \left( m-3 \right) }} = \\[1ex] &= \frac{m+12}{1} =m+12 \end{aligned} $$ |