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How do I find the domain and range of logarithmic and exponential equations?

Derek Hopper asked:


Can anyone please help?
How do I find the domain and range of logarithmic and exponential equations?
Advice on intercepts would help too…thanks in advance.

Domain Registar

Tags: Exponential Equations, Intercepts, Logarithmic

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3 Responses to “How do I find the domain and range of logarithmic and exponential equations?”

1. Andrew says:

   December 18, 2009 at 5:42 pm

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   For the domain of logarithmic functions - the argument of a logarithmic function must be positive

   log base 3 of 9 = 2

   log base 10 of 0.001 = -3

   the argument must be positive => hence

   log ( f(x) ) will have a domain limited to f(x) > 0
   the rangle for the log function will be R for the full domain

   e^x is the inverse of the natural log function. It has a domain of R and a Range of R+
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