Is there anywhere in here in the "web"world that i can find notes for matrices?

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  Let C be the matrix C=1,2 2,2 a.find the determinant of c b.find C to the power of -1 c. calculate C to the power of 2 = C xC d. calculate (C -1)square and (Csq)-1 and check they r the same
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  Prove that for any 2 vectors, U and V, we get ||U+V||^2 + ||U-V||^2 = 2(||U||^2 + ||V||^2). I have proven this with simple algebra. But what geometric fact does it prove?
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