College Algebra Fifth Edition James Stewart Lothar Redlin Saleem Watson. Functions. 3. What Is a Function?. 3.1. What is a Function?. Perhaps the most useful mathematical idea for modeling the real world is the concept of function, which we study in this chapter.
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James StewartLothar RedlinSaleem Watson
(c) Find the domain and range of f.
(d) Draw a machine diagram for f.
f(x) = x2, 0 ≤x ≤ 5
then the domain is the set of all real numbers x for which 0 ≤x ≤ 5.