Chapter 7 - Rational Functions - 7.1 Rational Functions and Variation - 7.1 Exercises - Page 567: 56

Domain: All real numbers except $x= 4, x= 7$

The table shows that the function is undefined for $x=4$ and $x= 7$. Hence, the domain is: \begin{equation} \begin{aligned} \text{Domain: }& \text{All real numbers}&\\ &\text{except }x= 4 \textbf{ and } x= 7. \end{aligned} \end{equation}