How do you evaluate #log_3 81#?
The answer is
The question that the
To what power do I have take
So in your case the question is:
To what power do I take
Usually, you will be working with '10-logs' or 'e-logs'.
Those you can find on your calculator:
If you use these buttons with shift or 2nd you get the opposite functions, the antilogs, marked as