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

Very VERY simple question

  1. Dec 9, 2004 #1
    compute the following:

    log base 4 (64) + 15*log base 32 (2)

    I can't remember how to solve something like this. Makes me feel like an idiot, but I figured it never hurts to ask.
  2. jcsd
  3. Dec 9, 2004 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You need the basic definition of a log.

    C = logB A iff BC = A

    Apply that definition and it should be pretty easy.
  4. Dec 9, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    I have strong reasons to believe that your answer is 6.
    To prove that for yourself,try to apply the following formula
    [tex]\log_{a}b =\frac{\log_{c} b}{\log_{c} a} [/tex]


    PS.I assumed you're familiar with this one:
    [tex] \log_{c} x^{y} = y\log_{c} x [/tex].
  5. Dec 9, 2004 #4


    User Avatar
    Science Advisor

    Integral's way is much simpler than dextercioby's.

    64= 43 so log4 64= ?

    32= 25 so 2= 321/5. What is log32 2?
    Last edited by a moderator: Dec 10, 2004
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook