log4(32) = 2.5
Explanation:
Given that, 
 log4(2) = 0.5
To find: log4(32) 
32 can be written as 2 power 5
 log4(32) = log4(2^5) 
 = 5 log4(2) 
In the logarithms if there is a power it is multiplied and only the log is applied to the base of the powered term. 
Hence, 
 log4(32) = 5log4(2) 
We know that log4(2) = 0.5
So, 
 log4(32) = 5(0.5) 
 log4(32) = 2.5