(a) A is a 4 x4 matrix and 2(A + I) = I. Enter det (A + I). (b) A is a 3 x3 matrix and -5 A +31 = 0. Enter det (A+I). (c) A is a 2 x 2 matrix and A² + 10 A +16 I = 0. If det (A +51) > 0, enter det (A +5I).

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