Results 1 to 2 of 2

Math Help - differentiate

  1. #1
    Newbie
    Joined
    Mar 2009
    Posts
    1

    Smile differentiate

    Hi
    I have been trying to solve this problem for a while but I don't understand how to do it. I know its related to finding deravatives and solving it.

    Find values for a,b, and c such that the graph of y=ax^2 + bx + c has a relative maximum at (3,12) and crosses the y-axis at (0,1).

    If anyone could explain me how to solve it it'll be greatly appreciated.

    Thank you.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor red_dog's Avatar
    Joined
    Jun 2007
    From
    Medgidia, Romania
    Posts
    1,252
    Thanks
    5
    Let f(x)=ax^2+bx+c

    f'(3)=0\Rightarrow 6a+b=0

    f(3)=12\Rightarrow 9c+3b+c=12

    f(0)=1\Rightarrow c=1

    Now solve the system.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. can you differentiate e^(x/(3+5x)) ?
    Posted in the Calculus Forum
    Replies: 2
    Last Post: November 5th 2010, 02:52 PM
  2. differentiate tan^3[2x]
    Posted in the Calculus Forum
    Replies: 1
    Last Post: September 15th 2010, 05:07 AM
  3. differentiate
    Posted in the Calculus Forum
    Replies: 1
    Last Post: July 22nd 2010, 03:56 AM
  4. How do you differentiate e^xy?
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 28th 2009, 09:57 AM
  5. Differentiate with e^x
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 9th 2008, 08:21 PM

Search Tags


/mathhelpforum @mathhelpforum