Comments on: How do I find the domain and range of logarithmic and exponential equations? http://www.domena.lapy.pl/2009/08/26/how-do-i-find-the-domain-and-range-of-logarithmic-and-exponential-equations/ Domain settings Sun, 26 Jun 2011 08:09:36 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Andrew http://www.domena.lapy.pl/2009/08/26/how-do-i-find-the-domain-and-range-of-logarithmic-and-exponential-equations/comment-page-1/#comment-17 Andrew Wed, 26 Aug 2009 20:24:05 +0000 http://www.domena.lapy.pl/2009/08/26/how-do-i-find-the-domain-and-range-of-logarithmic-and-exponential-equations/#comment-17 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+ 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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