# How do you use the Change of Base Formula and a calculator to evaluate the logarithm #log_3 40#?

##### 1 Answer

Jul 26, 2015

#### Answer:

You divide

#### Explanation:

Change of base means that you divide the log (to the new base) of the number by the log (to the new base) of the old base.

You may use

So:

Or:

Of course you can do this in one go, as long as you mind the brackets.