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If A = ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − − 1 4 3 2 , then adj (3A 2 + 12A) is equal to

1. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 72 84 63 51
2. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 72 63 84 51
3. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − − 51 84 63 72
4. ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − − 51 63 84 72

Correct answer: ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ 72 84 63 51

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