Results 1 to 3 of 3

Math Help - Fractional indicies question

  1. #1
    Member
    Joined
    Sep 2008
    Posts
    95

    Fractional indicies question

    I have become stuck on the following equation which i have to solve as part of my homework:

    2x^(1/3)+x^(2/3)=3

    According to the answer book the two solutions are 1 and -27, so it must turn out to be quadratic. However, i can't figure out how to get there.

    Any help would be greatly appreciated
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Kai
    Kai is offline
    Junior Member
    Joined
    Apr 2008
    Posts
    59
    Hi StaryNight,

    Use the substitution y= x^(1/3) and subsitute it in ur equation, hope it helps
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2008
    Posts
    95
    Cheers, that worked out fine. Wish i'd have thought of that in the first place.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Fractional indicies?
    Posted in the Algebra Forum
    Replies: 11
    Last Post: April 5th 2011, 08:32 PM
  2. Indicies
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 20th 2010, 12:57 PM
  3. Surds and fractional indicies
    Posted in the Algebra Forum
    Replies: 6
    Last Post: April 2nd 2010, 02:11 PM
  4. Indicies
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: March 10th 2010, 12:36 PM
  5. Indicies
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 14th 2008, 01:13 PM

Search Tags


/mathhelpforum @mathhelpforum