Results 1 to 2 of 2
Like Tree1Thanks
  • 1 Post By hedi

Math Help - Integration-guess and check

  1. #1
    Junior Member Greymalkin's Avatar
    Joined
    Jun 2012
    From
    Montreal
    Posts
    74
    Thanks
    1

    Integration-guess and check

    Why does \int \frac{3dx}{2x+5}=\frac{3}{2}ln|2x+5|?


    I get: \int \frac{3}{2x+5}=ln|2x+5|
    \frac{d}{dx} ln|2x+5|=\frac{1}{2x+5}
    So by my logic I would just multiply ln|2x+5| by 3, why is the coefficient 3\2 then?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Oct 2012
    From
    israel
    Posts
    108
    Thanks
    14

    Re: Integration-guess and check

    differentiation should be by the chain rule,so you need to multiply by the derivative of 2x
    Thanks from Greymalkin
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: January 20th 2010, 06:16 PM
  2. integration check
    Posted in the Calculus Forum
    Replies: 4
    Last Post: November 10th 2008, 11:54 AM
  3. integration check 2
    Posted in the Calculus Forum
    Replies: 8
    Last Post: November 10th 2008, 06:48 AM
  4. integration check
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 1st 2008, 09:50 PM

Search Tags


/mathhelpforum @mathhelpforum