Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Derivative of:

  1. Aug 4, 2010 #1
    1. The problem statement, all variables and given/known data

    I think it was: 3ln5x

    2. Relevant equations

    3. The attempt at a solution

    I just took it on a test. My professor said it was 3/x but I don't see how you get that?

    When you get the integral of 3/x how do you get the 3ln5x? Where does the 5 go? I don't understand :(
  2. jcsd
  3. Aug 4, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper

    It is 3/x if you mean to differentiate 3*ln(5*x). There are a couple of different ways to do this. i) use the chain rule, or ii) use the properties of logs before you differentiate.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook