logarithm

• a logarithm is used to find the exponent of a number (N)
whose base has been raised to equal N.
• the power to which the base has been raised
to produce the given number, e.g.
3² = 9, log₃9 = 2

EXAMPLES:

Logarithm Calculator

http://www.rapidtables.com/calc/math/Log_Calculator.htm