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: Equation point from a matrix

  1. Apr 4, 2010 #1
    1. The problem statement, all variables and given/known data
    Good evening everyone,, I have the following problem:

    3. The attempt at a solution

    disregarding the digit ,, he's giving me P(x) and want P(A) but A is a matrix ,, should I get the determinant of A then apply it in the equation ?? or it has some idea I need to know ??

    Attached Files:

    • Q.png
      File size:
      10.9 KB
  2. jcsd
  3. Apr 4, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You know how to multiply matrices

    You know how to add matrices

    I dare say maybe you can just plug in A directly and get an answer. This is pretty common, giving a polynomial where you think the input is supposed to be a number, but then you plug in matrices instead to see what you get
  4. Apr 4, 2010 #3


    Staff: Mentor

    And since P(A) involves matrices, not numbers, be sure to use I in place of 1 in your formula for P(A).
  5. Apr 4, 2010 #4
    aha, got it ... Really it's very easy ,, I feel stupid :shy:

    Thanks very much guys
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook