Domain: all possible input values
Range: all possible output values
For a graph, domain: all x-values shown
For a graph, range: all y-values shown
For a function rule, domain: values that do not make the expression undefined
Exclude values that cause division by zero
Exclude values inside an even root that make the radicand negative
Include all real numbers if no restrictions exist
Use interval notation to write domain and range
Use set notation to list domain and range values
For ordered pairs, domain: all first coordinates
For ordered pairs, range: all second coordinates