## College Algebra (10th Edition)

Domain: $(-\infty, +\infty); x \ne -5, 5$
In order to find when the function given exists, we have to find when it is undefined. Thus, we see when the bottom of the fraction is equal to 0: $$x^2 -25 = 0 \\ x^2 = 25 \\ x = \sqrt{25} \\x= \pm 5$$ Thus, the domain is: $(-\infty, +\infty); x \ne -5, 5$