Results 1 to 2 of 2

Math Help - Inflection points

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    43

    Inflection points

    Find the inflection points of f(x)=x/(5x^2+5)^2

    List the x-values:

    I found f''(x) which is f''(x)= 10x/(5x^2+5)^2

    I get 0, but this answer is wrong on my online hw

    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,829
    Thanks
    123
    Quote Originally Posted by Asuhuman18 View Post
    Find the inflection points of f(x)=x/(5x^2+5)^2

    List the x-values:

    I found f''(x) which is f''(x)= 10x/(5x^2+5)^2

    I get 0, but this answer is wrong on my online hw

    thanks
    I've got a different second derivative. And consequently 3 zeros of f''(x).

    Spoiler:
    f'(x)=\dfrac{1-3x^2}{5(x^2+1)^4}
    and
    f''(x)=\dfrac{12x(x^2  - 1)}{25(x^2+1)^3}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: August 24th 2011, 11:35 AM
  2. Replies: 16
    Last Post: June 10th 2011, 06:49 AM
  3. Replies: 1
    Last Post: April 20th 2010, 07:36 PM
  4. Replies: 2
    Last Post: October 29th 2009, 08:02 PM
  5. Replies: 5
    Last Post: February 27th 2009, 07:48 PM

Search Tags


/mathhelpforum @mathhelpforum