1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Simple derivative

  1. Mar 30, 2009 #1
    D= (x^2+x)^(1/2)

    I have a solutions manual here showing
    D' = (1/2)(x^2+x)^(-1/2) (2x+1)(x')
    but correct me if im wrong..
    D' = (1/2)(x^2+x)^(-1/2) (2x+1)(2x')
  2. jcsd
  3. Mar 30, 2009 #2


    User Avatar
    Homework Helper

    well you didn't state what you were taking derivatives with respect to.

    But if you have D(t)=f(x)

    then D'(t)=f'(x)* (dx/dt) = f'(x)*x'

    In your question; [itex]f(x)=\sqrt{x^2+x}[/itex]
  4. Mar 30, 2009 #3
    differentiating with respect to time t if you could please answer this simple question directly i would be glad especialy
  5. Mar 30, 2009 #4


    Staff: Mentor

    The first one is correct; the second one is incorrect.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook