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### Reviewing Domain and Range

Chapter 4 provided a discussion of how domain and range values can be understood in the context of relations. When you can establish a relation between a set you designate as a domain and another set you designate as a range, then you can usually create a function that defines the relation. A function constitutes a formalized relation between the values in the domain and the values in the range. As Figure 6.1 illustrates, you can depict this formalization using set notation. The expression f (x) reads, “the function of x” or, more briefly, “f of x.” It formally designates an equation that relates the domain and range. When you use such a function, you employ the values of the domain to generate the values of the range. ...

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