Question
Answer
$$\dfrac{x^2-9}{x+3}=x-3$$
Explanation
| $$ \begin{aligned}\frac{x^2-9}{x+3}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x-3\end{aligned} $$ | |
| ① | Simplify $ \dfrac{x^2-9}{x+3} $ to $ x-3$. Factor both the denominator and the numerator, then cancel the common factor. $\color{blue}{x+3}$. $$ \begin{aligned} \frac{x^2-9}{x+3} & =\frac{ \left( x-3 \right) \cdot \color{blue}{ \left( x+3 \right) }}{ 1 \cdot \color{blue}{ \left( x+3 \right) }} = \\[1ex] &= \frac{x-3}{1} =x-3 \end{aligned} $$ |
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Simplify Rational Expressions