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Sal introduces the concept of "range" of a function and gives examples for functions and their ranges.

Finding the range of a function, just by looking at its formula, is pretty difficult! Actually, it's not even that easy to tell whether a single specific value is a possible  ...

www.purplemath.com/modules/fcns2.htm

Discusses the domain and range of a function, and how to find the domain and range from a list of points or from a graph.

www.varsitytutors.com/hotmath/hotmath_help/topics/domain-and-range-of-rational-functions

The domain of a function f(x) is the set of all values for which the function is ... One way of finding the range of a rational function is by finding the domain of the  ...

www.wikihow.com/Find-the-Range-of-a-Function-in-Math

How to Find the Range of a Function in Math. The range of a function is the set of numbers that the function can produce. In other words, it is the set of y-values ...

www.intmath.com/functions-and-graphs/2a-domain-and-range.php

When finding the domain, remember: ... The range of a function is the complete set of all possible resulting values of the dependent variable (y, usually), after we  ...