The characteristic polynomial of A = a b c d is 2 (a+d) + (ad bc). By direct
Chapter 5, Problem 5.6.25(choose chapter or problem)
The characteristic polynomial of A = a b c d is 2 (a+d) + (ad bc). By direct substitution, verify Cayley-Hamilton: A 2 (a+d)A+ (ad bc)I = 0.
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