Answer
$\color{blue}{(-\infty, -2.5) \cup (-2.5, -1) \cup (-1, +\infty)}$
Work Step by Step
Find the domain of each function:
For $f(x)$, the value of $x$ cannot be $-1$ since it will make the denominator zero. .
Thus, the domain of $f(x)$ is $(-\infty, -1) \cup (-1, +\infty)$.
For $g(x)$, the value of $x$ can be any real number.
Thus, the domain of $g(x)$ is $(-\infty, +\infty)$.
RECALL:
The domain of the $(f/g)(x)$ is the common elements of the domains of $f(x)$ and $g(x)$ excluding $x$ values for which $g(x)=0$.
Note that when $g(-2.5)=0$.
Thus, the domain of $(f/g)(x)$ is the set of all real numbers except $-1$ and $-2.5$. In interval notation, the domain of $f/g$ is:
$\color{blue}{(-\infty, -2.5) \cup (-2.5, -1) \cup (-1, +\infty)}$
