Results 1 to 3 of 3
Like Tree1Thanks
  • 1 Post By MINOANMAN

Math Help - Solutions to 4 Degree Polynomial

  1. #1
    Junior Member ReneG's Avatar
    Joined
    Mar 2013
    From
    United States
    Posts
    67
    Thanks
    9

    Solutions to 4 Degree Polynomial

    I am trying to compute the solutions to \mathrm{f(x)} = x^4 + 5x^3 - 9x^2 - 45x

    I factored all the way up to \mathrm{f(0)} = (x+3)(x-3)(x^2 + 5x)

    Which gave me 3 out of 4 solutions x = \{-5, -3, 3\}

    My book says the final solution is 0 but I don't see how they got that.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member
    Joined
    Feb 2013
    From
    Saudi Arabia
    Posts
    443
    Thanks
    86

    Re: Solutions to 4 Degree Polynomial

    Rene

    Factorise the last term x^2+5x =x(x+5) then you will find x = 0 the fourth root...................
    the complete factorization is x(x-3)(x+3)(x+5) ...........
    Thanks from ReneG
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member ReneG's Avatar
    Joined
    Mar 2013
    From
    United States
    Posts
    67
    Thanks
    9

    Re: Solutions to 4 Degree Polynomial

    I'm such a dunce, thanks.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Polynomial Degree
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: June 27th 2012, 01:45 PM
  2. polynomial of degree 3
    Posted in the Algebra Forum
    Replies: 2
    Last Post: March 5th 2010, 07:28 AM
  3. 7th degree polynomial
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 24th 2009, 08:05 AM
  4. Polynomial of fifth degree
    Posted in the Calculus Forum
    Replies: 2
    Last Post: November 13th 2006, 08:25 AM
  5. 4th degree polynomial
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: September 27th 2005, 09:41 PM

Search Tags


/mathhelpforum @mathhelpforum