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Solution - Determinants - Adjoint Method

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Question

If `A^-1=1/3[[1,4,-2],[-2,-5,4],[1,-2,1]]` and | A | = 3, then (adj. A) = _______

(A)`1/9[[1,4,-2],[-2,-5,4],[1,-2,1]]`

(B)`[[1,-2,1],[4,-5,-2],[-2,4,1]]`

(C)`[[1,4,-2],[-2,-5,4],[1,-2,1]]`

(D)`[[-1,-4,2],[2,5,-4],[1,-2,1]]`

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Solution for concept: Determinants - Adjoint Method. For the courses 12th HSC Arts, 12th HSC Science (Computer Science), 12th HSC Science (Electronics), 12th HSC Science (General)
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