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: Find derivative of function?

  1. Nov 12, 2008 #1
    1. The problem statement, all variables and given/known data

    Find derivative of function?
    if f(x) = (x^2 + 3x -2 ) (x^3-4)
    Find f`(x)

    2. Relevant equations

    FOIL or Multiply both

    3. The attempt at a solution

    I get
    5x^4 + 12x^3 - 6x^2 -8x-12

    is this right?
     
  2. jcsd
  3. Nov 12, 2008 #2

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Yes, it's correct. Why do you think it might not be??
     
  4. Nov 13, 2008 #3
    just checking
     
  5. Nov 13, 2008 #4
    I'd use the product rule.
     
  6. Nov 14, 2008 #5
    yes i believe it is.
     
  7. Nov 14, 2008 #6

    HallsofIvy

    User Avatar
    Science Advisor

    You could check by using the product rule as ducnguyen2000 suggested:
    the derivative of f(x) = (x^2 + 3x -2 ) (x^3-4) is (x^2+ 3x- 2)'(x^3- 4)+ (x^2+ 3x- 2)(x^3- 4)'.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook