Which logarithm property is this?

In this equation:

http://c811129.r29.cf2.rackcdn.com/se03c01023.png

Which logarithm property is used to change log base 4 to log base 2? Is it just an application of the change of base theorem? Everything else makes sense to me but that.

EDIT: I feel dumb now. I just realized that it's the change of base theorem being used to change the base to log base 2, thus giving a simplified answer.

Re: Which logarithm property is this?

Hello, zsf1990!

Here is another approach.

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