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# Exponential Function - Learn About Exponential Growth and Decay

Exponential functions tell the stories of explosive change. The two types of exponential functions are exponential growth and exponential decay. Four variables — percent change, time, the amount at the beginning of the time period, and the amount at the end of the time period — play roles in exponential functions.

Use this page to learn more about exponential functions.

### 1. What are Exponential Growth Functions?

When an original amount is increased by a consistent rate over a period of time, exponential growth is occurring. The purpose of this page is to use exponential growth functions to make predictions.

### 2. What are Exponential Decay Functions?

When an original amount is reduced by a consistent rate over a period of time, exponential decay is happening. The purpose of this page is to use an exponential function - exponential decay - to make predictions.

### 3. Exponential Growth and Percent Increase

When an original amount is increased by a consistent rate over a period of time, exponential growth is happening. The purpose of this page is to learn more about that consistent rate. The key to understanding exponential growth is learning about percent increase.

### 4. Exponential Decay and Percent Change

When an original amount is reduced by a consistent rate over a period of time, exponential decay is happening. The purpose of this page is to learn more about that consistent rate, the decay factor. The key to understanding the decay factor is learning about percent change.

### 5. Solving Exponential Growth Functions

Four variables — growth factor, time, the amount at the beginning of the time period, and the amount at the end of the time period — play a role in exponential functions. This article focuses on how to use exponential growth functions to find the amount at the beginning of the time period.

### 6. Solving Exponential Decay Functions

This article focuses on how to use an exponential decay function to find the amount at the beginning of the time period.

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