S.O.S. Mathematics CyberBoard

This is the first time that i have to do with matrices and i really need your help.
i don't know how to find the solutions for these 3 questions.
if someone can please help me??????????
thanks you very much
maria

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nc

The first one isn't that bad, you just need to know how to multiply matricies, and show its true for A^1 (obviously) and then assume its true for A^n and show its true for A^n+1 which is just AA^n. If you don't know how to multiply matricies... then look it up in your book,notes, or on the web

For the third one, the |A| implies the determinant of A, so you need to settle on a method for calculating the determinant of your 3x3 matrix (Expansion by minors for example)


If you watn more specific help you'll have to show us what you tried and where you got stuck

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thank you very much for your help i finally found the solutions ! thanks for your help

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nc