Question: Let A be a square matrix. ( a ) If A 2 = I, what are the possible eigenvalues of A ? ( b )

Let A be a square matrix.
(a) If A2=I, what are the possible eigenvalues of A?
(b) If A is a 2 by 2 matrix, and not I nor -I, find its trace and determinant.
(c) If the first row is (3,-1), what is the second row?
Let A be a square matrix. (a) If A2=I, what are

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