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: Logarithmic function problems

  1. May 11, 2008 #1
    1. The problem statement, all variables and given/known data
    solve x.

    2. Relevant equations
    Log(a/b)=Log a - Log b

    3. The attempt at a solution
    The answers would be 3 or 2
    (so i'm guessing it has sumthing to do with quadratics)
    i tried to expand the left side first, then rearrange it to Log(7/x^4)=3
    the problem is thats not giving me the answer, which i got was 0.28925076.
    Last edited: May 11, 2008
  2. jcsd
  3. May 11, 2008 #2
    The relevant equations you gave aren't necessary for the problem.
    Move the Log(5-x) to the right hand side, then eliminate the logarithms. Then its just an algebra problem.
  4. May 11, 2008 #3
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook