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Algebra I

Range

The range of a function is the minimum and maximum values of y, or f(x). It isn't nearly as useful as domain because you can't affect the behavior of a function with it. Range is output not input. Range can give us an idea of what our function is doing. For example, if the range is small we'd know that no matter what input we put in, our output doesn't change much.

The range is [0, 13]. This may look like a graph of domain, but now we're paying attention to the y values. The square brackets mean 0 and 13 are part of the range.