Results 1 to 4 of 4

Math Help - Solving equations

  1. #1
    Newbie
    Joined
    Oct 2008
    Posts
    4

    Solving equations

    Hi, I need some help on this problem.

      \frac{2x^3-3x^3+x+1}{2x^3-3x^2-x-1} = \frac{3x^3-x^2+5x-13}{3x^3-x^3-5x+13}

    Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member vincisonfire's Avatar
    Joined
    Oct 2008
    From
    Sainte-Flavie
    Posts
    469
    Thanks
    2
    Awards
    1

    Reply

    For sure, 0 is a solution. If the problem tells you how much solutions you may be done!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by chaos787 View Post
    Hi, I need some help on this problem.

      \frac{2x^3-3x^3+x+1}{2x^3-3x^2-x-1} = \frac{3x^3-x^2+5x-13}{3x^3-x^3-5x+13}

    Thanks
    start by cross-multiplying: \frac ab = \frac cd \Longleftrightarrow ad = bc

    you can try factorizing first using the rational roots theorem and long division, but i doubt these can be factored. so try if you want, but you may end up having to go with my first suggestion
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member vincisonfire's Avatar
    Joined
    Oct 2008
    From
    Sainte-Flavie
    Posts
    469
    Thanks
    2
    Awards
    1

    Reply

    Do the cross multiplying thing, factor (take easy x^2 in front), and use derivative to prove there are no real root to the polynomial.
    The only answer should be 0.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 6
    Last Post: November 30th 2011, 02:41 AM
  2. solving equations?
    Posted in the Algebra Forum
    Replies: 5
    Last Post: December 18th 2009, 02:54 AM
  3. solving equations
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: August 23rd 2009, 12:28 PM
  4. solving equations
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 8th 2009, 12:06 PM
  5. solving equations
    Posted in the Algebra Forum
    Replies: 3
    Last Post: May 16th 2006, 04:58 PM

Search Tags


/mathhelpforum @mathhelpforum