Answer
$\ne$; $f$; $g$
Work Step by Step
The domain of the quotient function $\frac{f}{g}$ is the intersection of the domains of $f$ and $g$ minus the values of $x$ for which $g(x) = 0$ (this is because $g$ is in the denominator, and a denominator is not allowed to be zero).
Thus, the missing expressions in the given statement are (in order):
$\ne$; $f$; $g$
