Inspect the graph’s vertical extent, considering the upper and lower bounds for the y values.Make a list of these x values or the interval they fall within.Identify the set of x values for which the function has a defined output.Note the intervals where the function is defined.Look for vertical asymptotes or other gaps in the graph.Step 1: Enter the Functionįirst, turn on your TI-84 Plus graphing calculator and enter the function you want to analyze. In this guide, I will use the TI-84 Plus graphing calculator, a popular choice among students and professionals. There are several graphing calculator models available, and the process of calculating domain and range might differ slightly between them. For discrete functions, determine the set of y values that correspond to the domain.Ĭalculating Domain and Range on a Graphing Calculator.For continuous functions, inspect the graph’s vertical extent, considering the upper and lower bounds for the y values.For discrete functions, identify the set of x values for which the function has a defined output.These areas represent places where the function is not defined. For continuous functions, look for gaps, breaks, or asymptotes in the graph.By visually inspecting the graph, you can get an idea of the function’s behavior and the intervals for which it is defined. One of the most effective ways to determine the domain and range of a function is to graph it. It’s the collection of all y values that the function can produce. The range of a function is the set of all possible output values (usually represented by the variable y) that can be generated by the function when using the domain as input.
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