# Answer to Question #38453 in Matrix | Tensor Analysis for Sujata Roy

Question #38453

A is 4 rowed square matrix. |A|=4, adj(adj(A))=? a)2A b)4A c)8A d)16A

Expert's answer

Using Adjugate matrix properties we have

adj(adj(A))=det(A)^(n-2)A.

In our case n=4 and det(A)=4. Substitute these into previous formula

adj(adj(A))=4^(4-2)A=16A.

Therefore, d) is the right answer.

adj(adj(A))=det(A)^(n-2)A.

In our case n=4 and det(A)=4. Substitute these into previous formula

adj(adj(A))=4^(4-2)A=16A.

Therefore, d) is the right answer.

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## Comments

Assignment Expert21.01.14, 19:03Dear Sujata Roy,

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Sujata Roy20.01.14, 21:41Thank you.

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