Question
Answer
$$\dfrac{x^2-x-12}{x^2+8x+15}=\dfrac{x-4}{x+5}$$
Explanation
| $$ \begin{aligned}\frac{x^2-x-12}{x^2+8x+15}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{x-4}{x+5}\end{aligned} $$ | |
| ① | Simplify $ \dfrac{x^2-x-12}{x^2+8x+15} $ to $ \dfrac{x-4}{x+5} $. Factor both the denominator and the numerator, then cancel the common factor. $\color{blue}{x+3}$. $$ \begin{aligned} \frac{x^2-x-12}{x^2+8x+15} & =\frac{ \left( x-4 \right) \cdot \color{blue}{ \left( x+3 \right) }}{ \left( x+5 \right) \cdot \color{blue}{ \left( x+3 \right) }} = \\[1ex] &= \frac{x-4}{x+5} \end{aligned} $$ |
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Simplify Rational Expressions