Results 1 to 2 of 2

Math Help - matrices

  1. #1
    Newbie
    Joined
    Mar 2008
    Posts
    16

    matrices

    for which value of x is this matrix invertible:

    1 0 2
    2 x 2
    2 1 (x+1)

    Determinant of this matrix = 0

    I've worked out that x must be +1 or +2 but I'm stuck on where to go from there
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    You're doing OK. In order to be invertible, the determinant can't be 0.

    It is 0 at x=1 and x=2. Therefore, all other values must be in the domain of invertibility.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: November 25th 2010, 06:34 PM
  2. Total matrices and Commutative matrices in GL(r,Zn)
    Posted in the Advanced Algebra Forum
    Replies: 8
    Last Post: August 16th 2010, 02:11 AM
  3. Matrices Help
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: October 24th 2009, 09:36 PM
  4. Matrices represented by Symmetric/Skew Symmetric Matrices
    Posted in the Advanced Algebra Forum
    Replies: 7
    Last Post: October 25th 2008, 05:06 PM
  5. matrices
    Posted in the Algebra Forum
    Replies: 2
    Last Post: November 13th 2007, 02:36 PM

Search Tags


/mathhelpforum @mathhelpforum