Results 1 to 2 of 2

Math Help - find the solution set of the equation

  1. #1
    Newbie
    Joined
    Dec 2007
    Posts
    17

    find the solution set of the equation

    2/5x - x/4 = 4
    Follow Math Help Forum on Facebook and Google+

  2. #2
    GAMMA Mathematics
    colby2152's Avatar
    Joined
    Nov 2007
    From
    Alexandria, VA
    Posts
    1,172
    Awards
    1
    Quote Originally Posted by lovely08 View Post
    2/5x - x/4 = 4
    \frac{2}{5x} - \frac{x}{4} = 4

    Find a common denominator. Easy way to do that is multiply all denominators with each other: 5x*4 = 20x. Now, multiply the entire equality by 20x (same as multiplying each term by 20x).

    \frac{40x}{5x}- \frac{20x^2}{4} = 80x

    Simplify it...

    8-5x^2=80x
    5x^2+80x-8

    Quadratic formula will solve it...

    x = \frac{-80 \pm \sqrt{80^2 - 4(-8)(5)}}{10}
    x = \frac{-80 \pm -80.994}{10}
    x = -8 \pm - 8.0994
    x = 0.0994, -16.0994
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Find an equation for a given solution.
    Posted in the Algebra Forum
    Replies: 5
    Last Post: May 25th 2011, 04:43 AM
  2. Find the solution set of the equation
    Posted in the Advanced Algebra Forum
    Replies: 8
    Last Post: December 18th 2009, 09:50 PM
  3. Replies: 3
    Last Post: September 8th 2008, 05:07 PM
  4. Find the second solution of a differential equation
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: June 24th 2008, 08:10 AM
  5. find solution of equation
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 2nd 2008, 01:55 PM

Search Tags


/mathhelpforum @mathhelpforum