Results 1 to 5 of 5

Math Help - sum of two roots

  1. #1
    Junior Member
    Joined
    Jul 2010
    Posts
    25

    sum of two roots

    find


    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Opalg's Avatar
    Joined
    Aug 2007
    From
    Leeds, UK
    Posts
    4,041
    Thanks
    7
    Quote Originally Posted by fxs12 View Post
    find


    Hint: Try squaring it (and then take the square root after simplifying the result).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jul 2010
    Posts
    25
    there is asecond solution
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,856
    Thanks
    321
    Awards
    1
    Quote Originally Posted by fxs12 View Post
    there is asecond solution
    But only one of 6 or 4*sqrt(2) is correct. I admit I don't know how to tell which is right without a calculator though.

    -Dan
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member Quacky's Avatar
    Joined
    Nov 2009
    From
    Windsor, South-East England
    Posts
    901
    Quote Originally Posted by topsquark View Post
    But only one of 6 or 4*sqrt(2) is correct. I admit I don't know how to tell which is right without a calculator though.

    -Dan
    Six is correct. The 4*root(2) solution comes from when the first square root term is negative, as no sign is specified.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Roots & Imaginary Roots
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: October 4th 2009, 09:24 AM
  2. Roots
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 23rd 2008, 11:10 PM
  3. roots
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 14th 2008, 12:49 PM
  4. Roots
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 12th 2008, 11:52 AM
  5. Given 2 imaginary roots find other 2 roots
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: January 26th 2008, 09:24 PM

Search Tags


/mathhelpforum @mathhelpforum