Results 1 to 2 of 2

Math Help - critical numbers...

  1. #1
    Newbie
    Joined
    Sep 2007
    Posts
    11

    critical numbers...

    I just want to double check this. If I am given a function (such as x+(1/x)) where 0 is not in its domain, but comes up as a zero when I'm finding critical numbers, it's not a critical number because it's undefined and not in the domain anyway?

    Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Esiuol View Post
    I just want to double check this. If I am given a function (such as x+(1/x)) where 0 is not in its domain, but comes up as a zero when I'm finding critical numbers, it's not a critical number because it's undefined and not in the domain anyway?

    Thanks.
    If by a critical number you mean a zero of the derivative 0 is not a zero of
    the derivative of x+1/x, as the derivative is 1-1/(x^2) which is also
    undefined at x=0.

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Critical numbers
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 28th 2011, 03:00 AM
  2. critical numbers
    Posted in the Calculus Forum
    Replies: 5
    Last Post: November 18th 2009, 02:53 PM
  3. Critical Numbers
    Posted in the Calculus Forum
    Replies: 1
    Last Post: June 9th 2009, 08:07 PM
  4. Critical Numbers
    Posted in the Calculus Forum
    Replies: 4
    Last Post: November 2nd 2008, 04:38 PM
  5. Critical numbers
    Posted in the Calculus Forum
    Replies: 5
    Last Post: April 5th 2007, 06:09 PM

Search Tags


/mathhelpforum @mathhelpforum