# How do you evaluate #log_7 4# using the change of base formula?

##### 1 Answer

May 20, 2017

#### Answer:

#### Explanation:

#"Given " log_b a" then change of base is as follows"#

#• (log_(10)a)/(log_(10)b)#

#rArrlog_7 4=(log_(10)4)/(log_(10)7)~~0.7124#