Results 1 to 6 of 6

Math Help - Matrix =

  1. #1
    Member
    Joined
    Jun 2006
    Posts
    165

    Question Matrix =

    Code:
    [1  5]  [4  -2]
    [-2 3]  [0   1]
    My answer is
    Code:
       [5   3]
       [-2  4]
    Thanks for checking my answer.
    Last edited by CaptainBlack; July 20th 2006 at 11:00 AM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kwtolley
    Code:
    [1  5]  [4  -2]
    [-2 3]  [0   1]
    My answer is
    Code:
       [5   3]
       [-2  4]
    Thanks for checking my answer.
    Can't be as the top left element of the product is the dot product of the
    first row of the first matrix and the first column of the second, hence it
    is:

    [1,\  5] \cdot [4,\  0]=4,

    but your answer has 5 for this element.

    RonL
    Last edited by CaptainBlack; July 21st 2006 at 03:52 AM.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor Quick's Avatar
    Joined
    May 2006
    From
    New England
    Posts
    1,024
    Quote Originally Posted by kwtolley
    Code:
    [1  5]  [4  -2]
    [-2 3]  [0   1]
    My answer is
    Code:
       [5   3]
       [-2  4]
    Thanks for checking my answer.
    This is correct if you're adding the matrices together.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Quick
    This is correct if you're adding the matrices together.
    I suppose that is possible, maybe I lost something in reformatting the
    question that make this interpretation more likely.

    RonL
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Jun 2006
    Posts
    165

    Smile no adding

    This problem is written just like I posted it, so I'm not sure if I should have added, but I did. Thanks as always for checking.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kwtolley
    This problem is written just like I posted it, so I'm not sure if I should have added, but I did. Thanks as always for checking.
    If there is no addition sign between the matrices then the question is
    asking for the matrix prooduct, which is what my answer refered to.

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: November 27th 2010, 04:07 PM
  2. [SOLVED] Elementary matrix, restore to identity matrix
    Posted in the Advanced Algebra Forum
    Replies: 3
    Last Post: February 13th 2010, 10:04 AM
  3. unitary and upper triangular matrix => diagonal matrix
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: December 10th 2009, 07:52 PM
  4. Replies: 3
    Last Post: March 17th 2009, 11:10 AM
  5. Replies: 4
    Last Post: September 24th 2007, 05:12 AM

Search Tags


/mathhelpforum @mathhelpforum