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Other Examples: A rational function is the ratio of two polynomials P(x) and Q(x) like this. Except that Q(x) cannot be zero (and anywhere that Q(x)=0 is undefined) A root (or zero) is where the expression is equal to zero:
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.