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Introduction to Exponential Functions

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Videos, worksheets, games and activities to help PreCalculus students learn about exponential functions.

What is an exponential function?
An exponential function f is given by
f(x) = bx,
where x is any real number, b > 0 and b ≠ 1.

The number b is called the base.
If b > 1, f(x) is a positive, increasing, continuous function. In this case, f(x) is called an exponential growth function.
if 0 < b < 1, f(x) is a positive, decreasing, continuous function. In this case, f(x) is called an exponential decay function.

Graphs of Exponential Functions
We often encounter exponential functions in science and mathematics. Exponential functions have a unique set of characteristics and asymptotic behavior that make their graphs recognizable. It is important to be able to recognize the graphs of exponential functions, the graphs of their inverses (logarithmic functions) and to know properties that help us solve equations with exponents and logs.

Graph Exponential Functions
Graphing Exponential Functions

Exponential Functions Introduction
The video introduces exponential functions by contrasting them to linear and quadratic functions. It shows growth and decline functions, giving examples in nature. Examples shown are in population growth, half life, and musical tones.
Graphing Exponential Functions
This video shows how to graph two exponential functions by plotting points, discuss the domain and range and asymptotes as well as 4 extra graphs using transformations.


You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.

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