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The typical rational function has the form p(x)/q(x) where p and q are polynomials. p(x) is called the numerator and q(x) is called the denominator. Example: In the rational function. which simplifies to simplifies to (x+2)/(x-3), but the x = 2 is NOT in the domain of g(x) whereas it IS in the domain of (x+2)/(x-3).
Rational Expression Examples. For example; find the domain of. What the question is asking for are the values of x for which the rational function is said to exist or make mathematical sense. In other words, find the values of x for which the denominator is not equal to zero.