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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).
Definition of Rational Equation. A rational equation is an equation containing rational expressions. 1  Rational Expression: A rational expression is an expression of the form where Pand Q are nonzero polynomials.  Rational Function: A function written, as a quotient of polynomials is a rational function.