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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


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    Except for the above missing parentheses and exponentiation symbol, it is correct.
  4. Apr 6, 2015 #3
    Thank you
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