Answer
$$\frac{4-a}{a-4}=-1$$
Explanation
| $$ \begin{aligned}\frac{4-a}{a-4}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-1\end{aligned} $$ | |
| ① | Simplify $ \dfrac{4-a}{a-4} $ to $ -1$. Factor both the denominator and the numerator, then cancel the common factor. $\color{blue}{a-4}$. $$ \begin{aligned} \frac{4-a}{a-4} & =\frac{ \left( -1 \right) \cdot \color{blue}{ \left( a-4 \right) }}{ 1 \cdot \color{blue}{ \left( a-4 \right) }} = \\[1ex] &= \frac{-1}{1} =-1 \end{aligned} $$ |
This page was created using
Simplify Rational Expressions