Inverses
Sources
Khan, Salman. " An introduction to logarithms."
http://www.khanacademy.org/video/introduction-to-logarithms (accessed September 12, 2010).
Stapel, Elizabeth. "Logarithms: Introduction to 'The Relationship'." Purplemath. Available from http://www.purplemath.com/modules/logs.htm. Accessed 12 September 2010