Results 1 to 2 of 2

Math Help - Partial derivatives

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    13

    Partial derivatives

    Hi

    Having problem with this one

    Let f(x,y) = 4e^2y - xe^y
    a) Calculate f(4,0)
    b) Calculate f(a, ln(b)). Simplify as much as possible (your answer should not contain e)
    c) Calculate the first order partial derivatives f'x(x,y) and f'y(x,y). Simplify as much as possible

    I dont know what to do when "e" shows up.

    Thanks!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Lippi86 View Post
    Hi

    Having problem with this one

    Let f(x,y) = 4e^2y - xe^y
    a) Calculate f(4,0)
    b) Calculate f(a, ln(b)). Simplify as much as possible (your answer should not contain e)
    c) Calculate the first order partial derivatives f'x(x,y) and f'y(x,y). Simplify as much as possible

    I dont know what to do when "e" shows up.

    Thanks!!
    What do you mean "I dont know what to do when "e" shows up."?

    Do you mean you don't know how to differentiate an exponential function, or do you mean that you don't know how to simplify something like e^{2 \ln b} = e^{\ln b^2} = b^2 .... ?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. partial derivatives
    Posted in the Calculus Forum
    Replies: 6
    Last Post: February 24th 2011, 05:22 AM
  2. Help with partial derivatives
    Posted in the Calculus Forum
    Replies: 1
    Last Post: September 20th 2009, 12:57 AM
  3. Some partial derivatives
    Posted in the Calculus Forum
    Replies: 3
    Last Post: July 28th 2009, 05:55 AM
  4. need help on partial derivatives
    Posted in the Calculus Forum
    Replies: 9
    Last Post: November 13th 2008, 01:32 PM
  5. Partial derivatives
    Posted in the Calculus Forum
    Replies: 1
    Last Post: April 14th 2008, 11:43 AM

Search Tags


/mathhelpforum @mathhelpforum