# How do you use the Change of Base Formula and a calculator to evaluate the logarithm #log_3 21.8#?

##### 1 Answer

Sep 14, 2015

#### Answer:

Algorithm is described below.

#### Explanation:

The Change of Base Formula states, that :

So you can change logarythm to any base convinient. Calculators usually have 2 logarythms: decimal (base 10) and natural (base

To calculate it on a calculator you should:

1) Press 3 and "

2) Press "

3) Press

4) Press "/"

5) Press "

6) Press "=" to get final result.

Note: I described the algorithm using