Results 1 to 4 of 4

Math Help - Simple algebra problem

  1. #1
    Newbie
    Joined
    Mar 2010
    Posts
    9

    Simple algebra problem

    Does anyone know the correct method for solving 4x^2+2x = 8 ? Thanks in advance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Since 2 is a common factor you can divide through by 2: 2x^2+x=4

    Move the 4 over to the left hand side: 2x^2+x-4 = 0

    You can then solve the quadratic is your favourite way (I suggest the formula)
    Last edited by e^(i*pi); December 11th 2010 at 10:06 AM. Reason: see post 3
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,099
    Thanks
    67
    Quote Originally Posted by e^(i*pi) View Post
    You can then solve the quadratic is your favourite way (but this one factorises)
    Don't think so...discriminant = 33
    Follow Math Help Forum on Facebook and Google+

  4. #4
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by Wilmer View Post
    Don't think so...discriminant = 33
    Ta, I thought it was a square number for some reason
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simple (not for me) algebra problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 11th 2011, 09:01 AM
  2. Simple Algebra Problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: January 13th 2011, 10:52 PM
  3. Need Help with a simple algebra problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 18th 2010, 11:26 AM
  4. simple algebra problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: July 19th 2008, 09:13 PM
  5. simple algebra problem please help
    Posted in the Algebra Forum
    Replies: 9
    Last Post: April 16th 2008, 12:39 PM

Search Tags


/mathhelpforum @mathhelpforum