Results 1 to 2 of 2

Math Help - Factorising

  1. #1
    raiden
    Guest

    Factorising

    Please help in factorising this polynomial.

    y = 2x^3 - x^2 - 8x + 4

    also x + 2 is a factor
    i used the remainder theorem and then long divided the equation
    and i ended up with..

    (x+2)(2x+1)(x-3)

    help? lol
    many thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    Quote Originally Posted by raiden
    Please help in factorising this polynomial.

    y = 2x^3 - x^2 - 8x + 4

    also x + 2 is a factor
    i used the remainder theorem and then long divided the equation
    and i ended up with..

    (x+2)(2x+1)(x-3)

    help? lol
    many thanks
    Correction *Rayden not Raiden.

    Anyways,
    You have,
    2x^3-x^2-8x+4
    Group terms as,
    (2x^3-8x)-(x^2-4)
    Factor,
    2x(x^2-4)-(x^2-4)
    Factor again,
    (x^2-4)(2x-1)
    Factor again,
    (x+2)(x-2)(2x-1)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. factorising x^2 - x + 4
    Posted in the Algebra Forum
    Replies: 2
    Last Post: December 17th 2011, 04:23 AM
  2. Help with factorising
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 10th 2009, 12:35 PM
  3. Factorising 2
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 11th 2009, 06:28 AM
  4. factorising
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 27th 2009, 10:03 AM
  5. Factorising .
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: February 15th 2009, 06:00 AM

Search Tags


/mathhelpforum @mathhelpforum