Question

Consider the matrix A=[acbd]. Assume that (a−d)2=−4bc(a−d)2=−4bc holds. Is AA always diagonalizable? If your answer is...

Consider the matrix

A=[acbd].

Assume that (a−d)2=−4bc(a−d)2=−4bc holds. Is AA always diagonalizable? If your answer is yes prove it. If your answer is no, give an example that shows AA is diagonalizable and give another example that shows AA is not diagonalizable.

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