Question: 3. Let A be a 3 x 3 matrix. Assume that 21 - A, 31 A, and 4I A are not invertible. 1. Find

3. Let A be a 3 x 3 matrix. Assume that 21

3. Let A be a 3 x 3 matrix. Assume that 21 - A, 31 A, and 4I A are not invertible. 1. Find |A and tr(A). 2. Prove that I+5A is invertible.

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