18. Let A be a 3x3 real nonsingular matrix such that A^-1 = A. Characterize its eigenvalues. 1. -2, 1, or -1 2. 1 or 2 3. -1 or

Question

18. Let A be a 3x3 real nonsingular matrix such that A^-1 = A. Characterize its eigenvalues.
1. -2, 1, or -1
2. 1 or 2
3. -1 or -2
4. 1 or -1
5. -1, 1, or 2
6.  None of the above.

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