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Logarithm

The logarithm base b of a number x is the power to which b must be raised in order to equal x. This is written logb x. For example, log2 8 equals 3 since 23 = 8.

 

 

See also

Logarithm rules, common logarithm, natural logarithm, change of base formula

 


  this page updated 27-aug-12
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
NCTM Web Bytes December 2004 Web Bytes March 2005 Web Bytes