Results 1 to 3 of 3

Math Help - Derivative

  1. #1
    Junior Member
    Joined
    Dec 2008
    From
    America, Ohio
    Posts
    32

    Derivative

    Hi,

    Q1. Find the derivative of y=(3x-2)e^-x

    steps and answers would be appreciated,

    thanks,

    moon
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6
    Hello,
    Quote Originally Posted by Moon Hoplite View Post
    Hi,

    Q1. Find the derivative of y=(3x-2)e^-x

    steps and answers would be appreciated,

    thanks,

    moon
    Note that the derivative of e^(-x) is -e^(-x) (applying the chain rule).

    Now use the product rule to find the derivative :
    [uv]'=u'v+uv'


    > =(3x-2)' e^{-x}+(3x-2) (e^{-x})'=(3) e^{-x}+(3x-2) (-e^{-x})
    =e^{-x} \left(3-(3x-2)\right)=e^{-x}(-3x+5)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Moon Hoplite View Post
    Hi,

    Q1. Find the derivative of y=(3x-2)e^-x

    steps and answers would be appreciated,

    thanks,

    moon
    I don't do steps (I have two left feet when it comes to that).

    But I would suggest that you carefully apply the product rule, writing down every step in the calculation. Can you state the product rule and show the first few steps of using it in this problem ....?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. contuous weak derivative $\Rightarrow$ classic derivative ?
    Posted in the Differential Geometry Forum
    Replies: 2
    Last Post: April 22nd 2011, 02:37 AM
  2. Replies: 0
    Last Post: January 24th 2011, 11:40 AM
  3. [SOLVED] Definition of Derivative/Alt. form of the derivative
    Posted in the Calculus Forum
    Replies: 2
    Last Post: September 23rd 2010, 06:33 AM
  4. Derivative Increasing ==> Derivative Continuous
    Posted in the Differential Geometry Forum
    Replies: 2
    Last Post: February 23rd 2010, 10:58 AM
  5. Replies: 2
    Last Post: November 6th 2009, 02:51 PM

Search Tags


/mathhelpforum @mathhelpforum