Answer
$$ \text{Domain: All Real Numbers Except 4/3}$$
Work Step by Step
We see that the given function is in the form $f(x)=\frac{p(x)}{q(x)}$, since the values in the numerator and the denominator are functions. Thus, this is a rational function. Since rational functions do not exist when the denominator is equal to zero, it follows:
$$ \text{Domain: All Real Numbers Except 4/3}$$