Domain and range are often confused by students. Let's start with the basic definitions (always a good thing to do). The domain is the set of all first elements of ordered pairs (xcoordinates). The range is the set of all second elements of ordered pairs (ycoordinates). Let's take a simple example. What is the domain and range for points {(2,5), (4,8), (2,1), (3,5)}? Well, the set of x coordinates is {2,4,2,3} and the set of y coordinates is {5,8,1,5}. So the domain of these ordered pairs is {2,4,2,3} and the range is {5,8,1,5}. What about the domain of range of y = x^2 + 2?
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