Find the adjoint of the following matrices :
Problem 1 :
Problem 2 :
Problem 3 :
Problem 4 :
Problem 5 :
1. Answer :
To find adjoint of a 2x2 matrix, we have to switch the elements of the primary diagonal and change the signs of the elements of the secondary diagonal.
Therefore,
2. Answer :
3. Answer :
Find the cofactor of each element.
Cofactor of 1 :
Cofactor of 1 :
Cofactor of 1 :
Cofactor of 1 :
Cofactor of 2 :
Cofactor of -3 :
Cofactor of 2 :
Cofactor of -1 :
Cofactor of 3 :
The cofactor matrix of A is
Therefore,
4. Answer :
5. Answer :
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