Training Camp (cont 15)

The domain and range of a function are easy to see on the graph. The domain is the set of x-values for which the function is defined. The range is the set of y-values for which the function is defined. To find the domain and range of a function, look at which x and y values its graph includes.

Linear and cubic functions extend infinitely in both directions; therefore, they pass through all possible values of x and y. This indicates that an odd-degree polynomial has the set of real numbers as its domain and range.

	Linear function: domain = range =
	Cubic function: domain = range =

An even-degree polynomial has the set of real numbers as its domain, but it has a restricted range. The range is bounded at one end and unbounded at the other.