"Degree" has no meaning with respect to logarithms, at least that I know. I'm also unsure what you mean by "power" in your expression of the problem. Given the numbers, I have to presume you mean that the logarithm is to the base 4, like this:
which, in plain text, should have been represented thus:
log_4(64) = 3
Now, to represent any logarithm in exponential form use the following definition of the logarithm function:
For your problem: , , and , so you can write:
Which your scientific calculator will assure you is a true statement.
