Matrix algebra - matrix equation

  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. ah im sorry, I meant to put this in the question section, please move!
  4. radou

    radou 3,217
    Homework Helper

  5. matt grime

    matt grime 9,396
    Science Advisor
    Homework Helper

    Let me ask you this.

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