Results 1 to 2 of 2

Math Help - logarithms and graphs??

  1. #1
    jillybean
    Guest

    logarithms and graphs??

    how do I find the domain, x-intercept, and vertical asymptote of a log function?

    example: f(x)= log x
    7
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by jillybean View Post
    how do I find the domain, x-intercept, and vertical asymptote of a log function?

    example: f(x)= log x
    7
    I assume you mean,
    y=\log_7 x

    The domain are all positives.
    Thus, x>0.

    The vertical asymptote in a standard logarithm is the point where the domain breaks, i.e. x=0.

    The x-intercept is to solve,
    \log_7 x=0
    Thus,
    7^0=x=1
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Logarithms
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 7th 2010, 03:51 AM
  2. Logarithms
    Posted in the Algebra Forum
    Replies: 9
    Last Post: May 31st 2010, 06:42 PM
  3. Logarithms.
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: May 18th 2010, 04:01 AM
  4. Logarithms 2
    Posted in the Algebra Forum
    Replies: 3
    Last Post: April 19th 2010, 08:08 AM
  5. logarithms
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: August 26th 2008, 11:13 AM

Search Tags


/mathhelpforum @mathhelpforum