If A= bmatrix 1 & 2 & 2 2 & 1 & 2 2 & 2 & 1 bmatrix then what is A^2-4A equal to? where I_3 is the identity matrix of order 3.

NDA 2025 Mathematics question

then what is equal to? where is the identity matrix of order 3.

Answer: (D)

Each diagonal entry of is and each off-diagonal entry is, e.g., . So $ =

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Question ID VK-030038