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Homework Help: Having Issues with Solving Derivatives

  1. Jul 21, 2013 #1
    1. The problem statement, all variables and given/known data
    Use the definition of a derivative to compute the derivative of the function at the given value.
    P(t)=t^3-4, t=-2

    2. Relevant equations
    Please help me solve it in this form: f(a+h)-f(a)/h

    3. The attempt at a solution

    I am sick and tired of using the exact method the textbook gives me and getting answers that are miles off.
  2. jcsd
  3. Jul 21, 2013 #2


    User Avatar
    Homework Helper

    first find

    should be
    where I have replaced numbers with ? for you to fill in
  4. Jul 21, 2013 #3
    Last edited: Jul 21, 2013
  5. Jul 22, 2013 #4


    Staff: Mentor

    Looks good.
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