The power to which a 'base number' (usually 10) has to be raised to produce a given number.
as an example:
Log (base 10) of 100 = 2 ............ because 10 raised to the power of 2 (or 10
squared)...
The main use for a logarithm is to find an exponent. If N = a^x Then if we are told to find that exponent of the base (b) that will equal that value of N then the notation is: log N ....b And the...