# How do I find the equation of a geometric sequence?

##### 1 Answer

Apr 25, 2015

A geometric sequence is a list of terms that have a common ratio between them. For example, 4, 8, 16, 32, 64, 128, .... has a ratio of 2. For example, 100, 50, 25, 12.5, ... has a ratio of

Let's say you are given the following list of terms and asked to write the "equation" for it:

What is the first term? 8

What is the ratio?

So,