Rational Functions and Holes Practice Test

Consider the function $g(x)=\dfrac{x^2-4}{x-2}$. At which $x$-value is $g$ undefined due to a removable discontinuity?

Consider the function $u(x)=\dfrac{x^2-25}{x-5}$ for a fuel-usage model; what is the location of the hole in the function $u(x)$?