Results 1 to 6 of 6

Math Help - Inflection Points

  1. #1
    Member
    Joined
    Sep 2009
    From
    Ontario
    Posts
    162

    Inflection Points

    I am given a graph of a derivative to some function. (i don't know the equation of the function or the derivative). I need to list the x coordinates of the inflection points of the graph. what would these be and how can i spot them from the derivative graph?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,060
    Thanks
    894
    Quote Originally Posted by rawkstar View Post
    I am given a graph of a derivative to some function. (i don't know the equation of the function or the derivative). I need to list the x coordinates of the inflection points of the graph. what would these be and how can i spot them from the derivative graph?
    points on the graph where the slope of f' changes sign.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2009
    From
    Ontario
    Posts
    162
    so where the derivative graph is crosses the x axis?
    also on mine, there is a part where the graph is negative touches the x axis and then continues to be negative again. would that be an inflection point?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,060
    Thanks
    894
    Quote Originally Posted by rawkstar View Post
    so where the derivative graph is crosses the x axis? no

    also on mine, there is a part where the graph is negative touches the x axis and then continues to be negative again. would that be an inflection point?
    did you read and understand what I said previously?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Sep 2009
    From
    Ontario
    Posts
    162
    okay im rethinking it now.
    so there is a part of the graph that is linear changing from positive to negative. at the end of this line the derivative graph turns into an upside down u parabola which stays under the x axis.
    from what i thnk you're saying, the inflection point would be the end of the line where it turns into a parabola. is this right?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,060
    Thanks
    894
    Quote Originally Posted by rawkstar View Post
    okay im rethinking it now.
    so there is a part of the graph that is linear changing from positive to negative. at the end of this line the derivative graph turns into an upside down u parabola which stays under the x axis.
    from what i thnk you're saying, the inflection point would be the end of the line where it turns into a parabola. is this right?
    only if the slope of the graph changes sign there.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: August 24th 2011, 12:35 PM
  2. Replies: 16
    Last Post: June 10th 2011, 07:49 AM
  3. Replies: 1
    Last Post: April 20th 2010, 08:36 PM
  4. Replies: 2
    Last Post: October 29th 2009, 09:02 PM
  5. Replies: 5
    Last Post: February 27th 2009, 08:48 PM

Search Tags


/mathhelpforum @mathhelpforum