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Matrix algebra - matrix equation

  1. Oct 8, 2006 #1
    A=(5, 4) I (1, 0)
    (4,6) (0,1)

    Those are matrix by the way.

    How do I show A^2=11A-18I? I know i'm overlooking something, but i don't know what. Any tips would be helpful
  2. jcsd
  3. Oct 8, 2006 #2
    ah im sorry, I meant to put this in the question section, please move!
  4. Oct 8, 2006 #3


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    Do you know how to multiply matrices? You may want to look at this link: http://www.purplemath.com/modules/mtrxmult.htm" [Broken].
    Last edited by a moderator: May 2, 2017
  5. Oct 8, 2006 #4

    matt grime

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    Let me ask you this.

    Let x=3. How do you show that x^2=2x+3?
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