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: Natural log differentiation question

  1. Apr 6, 2015 #1
    1. The problem statement, all variables and given/known data
    f(x) = 1/ln (10-x) -- I would assume it to be a fairly simple equation, but I am screwing it up

    2. Relevant equations
    What is f'(x)?

    3. The attempt at a solution
    f'(x) = (ln (10-x))^-1
    = -(ln (10-x))^-2 * -1 * 1/(10-x) -- 2 negatives cancel out
    = 1/(10-x) (ln(10-x))2 -- This is as far as I got and I just can tell it isn't correct.

    Thank you in advance for all help.
  2. jcsd
  3. Apr 6, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Except for the above missing parentheses and exponentiation symbol, it is correct.
  4. Apr 6, 2015 #3
    Thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted