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Awkward Cubic Eqn

  • 25-08-2011 3:20pm
    #1
    Sully
    Moderators, Education Moderators, Technology & Internet Moderators, Regional South East Moderators Posts: 24,056 Mod ✭✭✭✭


    Hi folks.
    I'v came across a tricky cubic equation I cant seem to solve so I scanned a copy as I cant really explain it. When it comes to the first set of subtraction, how do I handle it when they are two different type of figures (x2 - x). Not 100% sure how I treat it so that I can carry on and work it out.

    Appreciate pointers on this. :)

    Thanks


Comments

  • #2
    Michael Collins
    Moderators, Science, Health & Environment Moderators Posts: 1,852 Mod ✭✭✭✭Michael Collins


    Just say there's a [latex] 0x^2 [/latex] component in your dividend. So it becomes [latex] 0x^2 - 4x^2 [/latex] and you get [latex] -4x^2 [/latex] then bring down the [latex] -13x [/latex] so the next line is [latex] -4x^2 - 13x [/latex].


  • #3
    doc_17
    Registered Users, Registered Users 2 Posts: 7,095 ✭✭✭doc_17


    rewrite the cubic eqn as follows: x^3 + 0x^2 -13x + 12

    Now proceed as per your origional attempt


  • #4
    Sully
    Moderators, Education Moderators, Technology & Internet Moderators, Regional South East Moderators Posts: 24,056 Mod ✭✭✭✭Sully


    Thanks lads, knew it was something simple. :)


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