Results 1 to 2 of 2

Math Help - Solving exponential

  1. #1
    Junior Member
    Joined
    Mar 2007
    Posts
    32

    Post Solving exponential

    Hi,
    I don't get this question so well. Can somebody pls help!
    Find the zeros of the function:

    f(x)=x(e^-x) - e^-x

    Thank you

    Isabel
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by cuteisa89 View Post
    Hi,
    I don't get this question so well. Can somebody pls help!
    Find the zeros of the function:

    f(x)=x(e^-x) - e^-x

    Thank you

    Isabel
    first let's factor out the e^-x

    => f(x) = (e^-x)(x - 1)

    to find the zeroes, we must solve:
    (e^-x)(x - 1) = 0

    => e^-x = 0 or x - 1 = 0

    however, e^-x is never 0

    so we must have x - 1 = 0
    => x = 1
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Exponential with E^-kt, solving for t
    Posted in the Algebra Forum
    Replies: 4
    Last Post: August 9th 2011, 08:48 AM
  2. Solving an exponential equation
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 20th 2011, 06:19 PM
  3. solving for x, exponential
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: January 25th 2010, 02:23 AM
  4. Solving Exponential Equations
    Posted in the Algebra Forum
    Replies: 4
    Last Post: October 6th 2009, 08:10 PM
  5. need help solving an exponential
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 18th 2006, 11:53 AM

Search Tags


/mathhelpforum @mathhelpforum