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1st and 2nd derivative of a cubic function. and graphing

  1. Mar 26, 2012 #1
    Hey forum, I know this is an easy one, but it's been a while for me :P
    thanks for your help!
    1. The problem statement, all variables and given/known data
    Given the following graph of h(x) hvyrk4.jpg

    a) The intervals where h(x) is increasing and decreasing
    b) The local maximum and minimum points of h(x)
    c) The intervals where h(x) is concave up and concave down
    d) The inflection points of h(x)
    e) Sketch the graphs of h’(x) and h’’(x)

    3. The attempt at a solution

    So far I have:

    a)The function is not decreasing, and hence h’(x) is not < 0
    The function is increasing, and hence h’(x) > 0 when x < 2 and x > 2

    b) there are no maximum or minimum points

    c)The function is concave up and hence h’’(x) > 0 when x > 2
    The function is concave down and hence h’’(x) < 0 when x < 2

    d)The inflection point occurs at x = 2

    If someone could check this for me I would really appreciate it..
    its especially part b) that I'm worried about
    I know this question isn't very hard but it's been a long time since I've worked with graphs and my confidence is lacking. Thanks to anyone who can share some insight!
     
  2. jcsd
  3. Mar 27, 2012 #2
    here are sketches for my graphs:
    308f721.jpg
    how do they look?
    thanks again!
     
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