Results 1 to 3 of 3

Math Help - solving logarithm

  1. #1
    Newbie
    Joined
    Nov 2010
    Posts
    23

    solving logarithm

    I can solve basic logarithms but I can't figure out how to solve this one. I tried reviewing the rules of logarithm and I thought that I should start solving from right to left but still can't get a valid answer.


    solving logarithm-12.png

    Find z.

    The selections are a)0 b)1 c)2 d)3


    Any ideas ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member
    Joined
    Dec 2008
    Posts
    288
    Well if you want all that equal to 0 you need the last log to be log of 1.
    So log3(9)=2 so you was logz(2)=1
    does that help?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor FernandoRevilla's Avatar
    Joined
    Nov 2010
    From
    Madrid, Spain
    Posts
    2,162
    Thanks
    45
    We have:

    \log_2[\log_z(\log_39)]=0 \Leftrightarrow \log_2(\log_z2)=0 \Leftrightarrow \log_z2=1 \Leftrightarrow z=2

    Regards.

    Fernando Revilla

    Edited: Sorry hmmmm I didn't see your post.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] logarithm equations! need a little help solving...
    Posted in the Algebra Forum
    Replies: 9
    Last Post: December 24th 2010, 08:32 PM
  2. Help with solving this logarithm
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 2nd 2010, 09:08 PM
  3. Solving for x in a logarithm
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 21st 2009, 06:53 AM
  4. Need help solving this logarithm
    Posted in the Algebra Forum
    Replies: 4
    Last Post: December 17th 2008, 05:34 AM
  5. Solving a logarithm equation
    Posted in the Algebra Forum
    Replies: 9
    Last Post: May 22nd 2006, 11:51 AM

Search Tags


/mathhelpforum @mathhelpforum