# How do you use #log10^5=.6990# and #log10^7=.8451# to evaluate the expression# log_10 35#?

##### 1 Answer

May 3, 2016

#### Answer:

Log form and index form are interchangeable.

Remember that logs are indices - the same laws apply.

#### Explanation:

If

Let's change from log from to index form first.

If the bases (10) are the same and you are multiplying, add the indices.