Results 1 to 3 of 3

Math Help - Quadratic help

  1. #1
    Newbie
    Joined
    Mar 2008
    Posts
    20

    Quadratic help

    i have this equation

    500x^2-250x-30=0

    i keep getting an imaginary number when i try to work this out.

    Should i use the negative on -250 when i am squaring it? Could some one take me through how to work this out using the quadratic forumula.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28
    Quote Originally Posted by Lucy1 View Post
    i have this equation

    500x^2-250x-30=0

    i keep getting an imaginary number when i try to work this out.

    Should i use the negative on -250 when i am squaring it? Could some one take me through how to work this out using the quadratic forumula.

    (-250)^2 = 62500

    x = \frac{250\pm\sqrt{62500-(4\times 500\times -30)}}{2\times 500}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,116
    Thanks
    68
    Quote Originally Posted by Lucy1 View Post
    500x^2-250x-30=0
    Simplify first; divide by 10:
    50x^2 - 25x - 3 = 0
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Quadratic help
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 11th 2010, 06:42 PM
  2. quadratic?
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: February 10th 2010, 06:05 AM
  3. Replies: 10
    Last Post: May 6th 2009, 10:52 AM
  4. Replies: 1
    Last Post: June 12th 2008, 10:30 PM
  5. Quadratic Eq.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 27th 2008, 07:54 PM

Search Tags


/mathhelpforum @mathhelpforum