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Homework Help: Differentiation homework

  1. Jul 20, 2010 #1
    1. The problem statement, all variables and given/known data

    If y = x³ + 2x
    and
    dx/dt = 5,
    find
    dy/dt when x = 2.


    3. The attempt at a solution

    I'm not really sure how to solve this problem at all. It's the first I've seen like this so I don't know what approach I should take.
     
  2. jcsd
  3. Jul 20, 2010 #2

    hunt_mat

    User Avatar
    Homework Helper

    Re: Differentiation

    Use the chain rule in the form:
    [tex]
    \frac{dy}{dt}=\frac{dy}{dx}\frac{dx}{dt}
    [/tex]
     
  4. Jul 20, 2010 #3
    Re: Differentiation

    Thank you so much!
     
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