Results 1 to 2 of 2
Like Tree3Thanks
  • 3 Post By romsek

Thread: Finding solution for natural logarithm equation

  1. #1
    Senior Member
    Joined
    Mar 2017
    From
    Massachusetts
    Posts
    348
    Thanks
    3

    Question Finding solution for natural logarithm equation

    Hi,

    Can someone please explain to me why when solving for $2\ln{x} + \ln{x+2} - \ln{x^2 + 2x} = -\ln{2}$ the solutions for x are 0, 1/2, and -2,but when you substitute these values back into the equation, only x = 1/2 works?

    There may be some elementary concept relating to systems of equations that I am missing here, and so I would really appreciate some help!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Nov 2013
    From
    California
    Posts
    6,580
    Thanks
    2913

    Re: Finding solution for natural logarithm equation

    over the reals 0 and -2 are outside of the domain of $\ln(x)$
    Thanks from Archie, topsquark and otownsend
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Natural Logarithm Regression Equation
    Posted in the New Users Forum
    Replies: 0
    Last Post: Sep 6th 2012, 07:18 PM
  2. Natural logarithm equation
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: Apr 12th 2012, 06:30 AM
  3. Unknown Solution to Equation involving Natural Logarithm
    Posted in the Advanced Math Topics Forum
    Replies: 3
    Last Post: Jan 6th 2011, 06:56 PM
  4. Natural Logarithm Regression Equation
    Posted in the Calculus Forum
    Replies: 1
    Last Post: Aug 10th 2009, 08:03 AM
  5. Replies: 4
    Last Post: Sep 23rd 2008, 11:50 AM

Search Tags


/mathhelpforum @mathhelpforum