Good idea to look up "Rules of Logarithms" and commit them to memory. You'll need two such rules here. One rule looks like this:
a log b = log b^a (a becomes the exponent of the argument b)
Apply this rule to the given 4 log 3.
The other rule has to do with products: log a + log b = log a*b.
Apply this rule after you've followed my previous suggestion.