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4 1 Exponential Functions and Their Graphs

Page 1 ( section ) 7 6 5 4 3 2 112345678 8 7 6 5 4 3 2 Exponential Functions and Their Graphs In this section you will learn to: evaluate Exponential Functions graph Exponential Functions use transformations to graph Exponential Functions use compound interest formulas An Exponential function f with base b is defined by xbxf=)( or xby=, where b > 0, b 1, and x is any real number. Note: Any transformation of xby= is also an Exponential function. Example 1: Determine which Functions are Exponential Functions . For those that are not, explain why they are not Exponential Functions . (a) 72)(+=xxf Yes No _____ (b) 2)(xxg= Yes No _____ (c) xxh1)(= Yes No _____ (d) xxxf=)( Yes No _____ (e) xxh =103)( Yes No _____ (f) 53)(1+ =+xxf Yes No _____ (g) 5)3()(1+ =+xxg Yes No _____ (h) 12)( =xxh Yes No _____ Example 2: Graph each of the following and find the domain and range for each function.

Page 4 (Section 4.1) Periodic Interest Formula Continuous Interest Formula nt n r A P = 1+ A = Pe rt A = balance in the account (Amount after t years) P = principal (beginning amount in the account) r = annual interest rate (as a decimal) n = number of times interest is compounded per year t = time (in years) Example 5: Find the accumulated value of a $5000 investment which is …

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