Question 724729
Use the rule <img src="http://latex.codecogs.com/gif.latex?b^x = y \to \log_b(y) = x" title="b^x = y \to \log_b(y) = x" />


to go from <img src="http://latex.codecogs.com/gif.latex?2^2 = 4" title="2^2 = 4" /> to <img src="http://latex.codecogs.com/gif.latex?\log_2(4)=2" title="\log_2(4)=2" />



So the final answer is <img src="http://latex.codecogs.com/gif.latex?\log_2(4)=2" title="\log_2(4)=2" />