Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Matrix Help ahhh

  1. Oct 13, 2007 #1
    Matrix Help!! ahhh

    http://img152.imageshack.us/img152/9982/matrixnq8.gif [Broken]

    What values of k does the system not have a solution?

    I don't know how to do this question. Anybody have any ideas? :)
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Oct 13, 2007 #2


    User Avatar
    Gold Member

    Perform a matrix operation to one of the rows so that you can solve for one of the variables, in terms of k. What i would do is eliminate the 1 from the bottom row, so that it is of the form:

    [ 0 f(k) g(k) ]

    Then use the fact that if 0x = c (where c is some non zero constant), then the equation cannot be solved.
  4. Oct 14, 2007 #3


    User Avatar
    Science Advisor
    Homework Helper

    Another way to do this is when the determinant of the matrix is zero, then this system of equations has no solution.
  5. Oct 14, 2007 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Yes: try and solve the system.
    Last edited by a moderator: May 3, 2017
  6. Oct 14, 2007 #5
    You mean no unique sol'n. This is for the op's knowledge.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook