This week returning from Orlando I learned about domain and range. The Domain of a relation is the set of all possible values which can be used for the input of the independent variable. The Range of a relation is the set of all possible values of the output of the dependent variable.

In a set of ordered pairs, a table of values and a mapping (arrow) diagram, the Domain and Range can be found by listing the inputs and outputs:

For example Ordered Pairs:

(2,3), (1,4), (0,8), (7,9), (-3,5)

D: {-3, 0, 1, 2, 7}

R: {3, 4, 8, 9, 5}

When we get into determining Domain and Range of graphs, it becomes a little confusing. So something important to remember is that the X Values= Input Values = Domain, and that the Y Values= Output Values = Range

When determining the Domain and Range of graphs, there are two types of brackets that can be used, and it’s important to know how to use both:

Closed Brackets: Including the given number the side the bracket is on – [ ]

Open Brackets: Not including the given number the side the bracket is on – ( )