Find the adjoint of each of the following Matrices and Verify that (adj A) A = |A| I = A (adj A)
Verify that (adj A) A=|A| I=A (adj A) for the above matrices.
A = 
Cofactors of A are:
C11 = – 3 C21 = 2 C31 = 2
C12 = 2 C22 = – 3 C23 = 2
C13 = 2 C23 = 2 C33 = – 3
adj A = 
= 
Now, (adj A).A = 
= 
= 
Also, |A|.I = 
= ( – 3 + 4 + 4)
= 
Then, A.(adj A) = 
= 
= 
Since, (adj A).A = |A|.I = A(adj A)
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