Results 1 to 2 of 2

Math Help - using quadratic formula to find irrational roots

  1. #1
    Junior Member
    Joined
    Dec 2009
    Posts
    71

    using quadratic formula to find irrational roots

    given x^4-5x^2+4...how can i use the quadratic formula to find irrational roots? i know that i need to transform x^4...but i don't know how...
    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor undefined's Avatar
    Joined
    Mar 2010
    From
    Chicago
    Posts
    2,340
    Awards
    1
    Quote Originally Posted by alessandromangione View Post
    given x^4-5x^2+4...how can i use the quadratic formula to find irrational roots? i know that i need to transform x^4...but i don't know how...
    thanks
    x^4-5x^2+4=0

    Let y=x^2

    So y^2-5y+4=0

    Solve for y, then go back and find x.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: February 29th 2012, 01:46 PM
  2. Replies: 4
    Last Post: September 28th 2011, 05:18 AM
  3. Quadratic formula to find zero
    Posted in the Algebra Forum
    Replies: 3
    Last Post: May 2nd 2010, 05:39 PM
  4. Find quadratic using its roots.
    Posted in the Algebra Forum
    Replies: 3
    Last Post: January 27th 2010, 02:34 AM
  5. Quadratic formula for complex roots
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 31st 2009, 11:04 AM

Search Tags


/mathhelpforum @mathhelpforum