Results 1 to 2 of 2

Math Help - quick graph question

  1. #1
    Junior Member
    Joined
    Sep 2007
    Posts
    29

    quick graph question

    Ok, you guys probably will think a preschooler could do this....and you would probably be right..but...the question is...At which of the five points on the graph in the figure above are dy/dx and d^2y/dx^2 both negative.

    The answer is B, but I have no idea why. I drew a rough sketch in paint here

    Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by jst706 View Post
    Ok, you guys probably will think a preschooler could do this....and you would probably be right..but...the question is...At which of the five points on the graph in the figure above are dy/dx and d^2y/dx^2 both negative.

    The answer is B, but I have no idea why. I drew a rough sketch in paint here

    Thanks
    a preschooler doing calculus? highly unlikely.


    \frac {dy}{dx} < 0 means the function is decreasing

    \frac {d^2y}{dx^2} < 0 means the function is concave down

    B is the only point that fulfills those conditions
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. quick graph theory question
    Posted in the Discrete Math Forum
    Replies: 1
    Last Post: May 10th 2010, 08:25 PM
  2. Quick graph questions
    Posted in the Algebra Forum
    Replies: 9
    Last Post: August 13th 2009, 04:03 PM
  3. quick question
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: June 15th 2009, 01:36 PM
  4. Quick Question
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: May 22nd 2008, 11:19 AM
  5. Quick's quick question
    Posted in the Number Theory Forum
    Replies: 22
    Last Post: July 9th 2006, 04:38 PM

Search Tags


/mathhelpforum @mathhelpforum