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3. degree equation

  1. Sep 9, 2009 #1
    1. The problem statement, all variables and given/known data
    Find exact solutions on this equation:
    20x3-79x2+2x+1=0
    The decimal approximation should be
    x=-0,099455 or x=0,128209 or x=3,921246

    2. Relevant equations

    xy=1 and y2+2y=79-20x
    gives:
    20x3-79x2+2x+1=0

    3. The attempt at a solution
    http://folk.ntnu.no/jonvegar/1 [Broken]
    http://folk.ntnu.no/jonvegar/2 [Broken]
    Here I get approx x=3,784.
    Not the same as my computer says...
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
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