Results 1 to 2 of 2

Math Help - ln equation

  1. #1
    Member
    Joined
    Nov 2010
    Posts
    93

    ln equation

    Hello, my attempt at solving this equation:

    '10000 = 250e^(t*ln2)' for t comes out at:

    ln40/ln2.

    However my textbook says the answer is ln4/ln2.
    Can someone please confirm which one it is.

    Thanks kindly
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Reckoner's Avatar
    Joined
    May 2008
    From
    Baltimore, MD (USA)
    Posts
    1,024
    Thanks
    75
    Awards
    1

    Re: ln equation

    Quote Originally Posted by fran1942 View Post
    Hello, my attempt at solving this equation:

    '10000 = 250e^(t*ln2)' for t comes out at:

    ln40/ln2.

    However my textbook says the answer is ln4/ln2.
    Can someone please confirm which one it is.
    You are correct. And anyway, if the answer was \frac{\ln4}{\ln2}, that would simplify to just 2 (from the change of base formula):

    \frac{\ln4}{\ln2}=\log_24=2,

    and 2 definitely isn't the solution.

    Edit: Make sure you copied the problem correctly though. If the 10,000 is supposed to be 1,000, then the book would be correct.
    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