# How do you use the Change of Base Formula and a calculator to evaluate the logarithm #log_15 7#?

##### 1 Answer

Feb 9, 2016

#### Answer:

The change of base rule is:

#### Explanation:

Now that both logs are in base 10, you can evaluate using a regular scientific calculator by pressing the button labelled "log".

Answer: 1.39

Hopefully this helps!