Results 1 to 3 of 3

Math Help - Log equation

  1. #1
    Newbie
    Joined
    May 2011
    Posts
    12

    Log equation

    Hi

    I'm stuck on this question.

    Solve the equation logx8 + logx4 = 5.

    Thanks in advance
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,315
    Thanks
    1224
    First, simplify the LHS using \displaystyle \log{a} + \log{b} = \log{(ab)}...
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by HighlyFlammable View Post
    Hi

    I'm stuck on this question.

    Solve the equation logx8 + logx4 = 5.

    Thanks in advance
    When stuck, do the obvious.

    The obvious thing to do in this case is apply a basic log rule to get \log_x(32) = 5, from which it follows that x^5 = 32. It ought to be simple to get x from here.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: April 11th 2011, 01:17 AM
  2. Partial differential equation-wave equation - dimensional analysis
    Posted in the Differential Equations Forum
    Replies: 3
    Last Post: August 28th 2009, 11:39 AM
  3. Replies: 2
    Last Post: May 18th 2009, 12:51 PM
  4. Replies: 2
    Last Post: April 28th 2009, 06:42 AM
  5. Replies: 1
    Last Post: October 23rd 2008, 03:39 AM

Search Tags


/mathhelpforum @mathhelpforum