## Algebra and Trigonometry 10th Edition

Domain: X is on the interval ($-\infty$, -2) U (-2, 2) U (2, $\infty$)
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 $x^{2}$ - 4, so: $x^{2}$ - 4 = 0 This can be factored into: (x + 2)(x - 2) = 0 x = -2, 2 Therefore, the domain is all real numbers except where x = -2 and x = 2.