**The Domains In Interval Notation**. Learn how to find the domain of rational functions. We use interval notation to represent subsets of real numbers.

In interval notation the domain is 1973 2008 and the range is about 180 2010. Try It 6 Given the graph in Figure 10 identify the domain and range using interval notation. 14 The domain and range of a function A brief review of interval notation An interval is a connected subset of the real number line.

### The domain of a rational function is the set of real numbers where the expression defining the rational function makes sense.

In interval notation the domain is 1973 2008 and the range is about 180 2010. Though not as compact as interval notation it is a way that mathematicians use to convey two important pieces of information. Set notation is used to indicate the domain and range as a set of numbers. In interval notation an interval is specified by an ordered pair of numbers consisting of the left and the right endpoints of the interval.