Results 1 to 5 of 5

Math Help - roots in real

  1. #1
    Senior Member
    Joined
    Sep 2012
    From
    Sweden
    Posts
    250
    Thanks
    6

    roots in real

    oose equation for x, find all solutions in real numbers
    x^4-13*x^3+41*x^2+13*x-42 = 0
    place the answers in increasing order
    ____≤____≤___≤___

    the roots i fined x= -1,1,5,7 but they want the answer in real numbers =S?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78

    Re: roots in real

    Quote Originally Posted by Petrus View Post
    oose equation for x, find all solutions in real numbers
    x^4-13*x^3+41*x^2+13*x-42 = 0
    place the answers in increasing order
    ____≤____≤___≤___

    the roots i fined x= -1,1,5,7 but they want the answer in real numbers =S?
    You have an error. 5 cannot be a rational root of the polynomial becuase it is not a factor of 42!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Sep 2012
    From
    Sweden
    Posts
    250
    Thanks
    6

    Re: roots in real

    i mean 6 but how do i answer in real number, like 6/1?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Mar 2008
    Posts
    934
    Thanks
    33
    Awards
    1

    Re: roots in real

    Quote Originally Posted by Petrus View Post
    oose equation for x, find all solutions in real numbers
    x^4-13*x^3+41*x^2+13*x-42 = 0
    place the answers in increasing order
    ____≤____≤___≤___

    the roots i fined x= -1,1,5,7 but they want the answer in real numbers =S?
    Petrus,

    "Find all solutions in real numbers" means you are to find all the solutions which are real (like 6), as opposed to complex (like 2+i).

    So assuming you have found all the solutions (I haven't checked your work), you are done. 6 is 6, you don't have to write it any other way.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member
    Joined
    Sep 2012
    From
    Sweden
    Posts
    250
    Thanks
    6

    Re: roots in real

    sorry i did misinterpreted what real number is ^^ solved it =D=D=D
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Real and non-real roots to a quintic equation
    Posted in the Pre-Calculus Forum
    Replies: 8
    Last Post: February 14th 2011, 09:42 PM
  2. Replies: 7
    Last Post: February 10th 2011, 09:34 PM
  3. No real roots
    Posted in the Calculus Forum
    Replies: 1
    Last Post: September 13th 2009, 03:54 AM
  4. Replies: 8
    Last Post: April 7th 2009, 01:15 PM
  5. Real Roots
    Posted in the Algebra Forum
    Replies: 3
    Last Post: June 11th 2007, 08:00 PM

Search Tags


/mathhelpforum @mathhelpforum