Chapter 4 - 4.1 - Rational Functions and Asymptotes - 4.1 Exercises - Page 315: 8

Domain: X is on the interval ($-\infty$, 3) U (3, $\infty$)

A denominator cannot be zero, so the domain is all real numbers except the x value where the denominator is 0. In this problem the denominator is x - 3, so: x - 3 = 0 x = 3 Therefore, the domain is all real numbers except where x = 3.