I would suggest that you take a good look at the logharitmic laws, and exponent laws as well.
You simply must now then well enough in order to solve these types of equations.
log2 (4x) = log 2 (4) + log2 (x)
These are one of the laws.
Another example: lg (10/3) = lg (10) - lg(3) = 1 - lg(3)
This is the second law.
I really really think you´ll easy crack these once you´ve mastered this laws.