Answer :

A = and B – 1 =


Here , (AB) – 1 = B – 1 A – 1


|A| = – 5 + 4 = – 1


Cofactors of A are:


C11 = – 1 C21 = 8 C31 = – 12


C12 = 0 C22 = 1 C32 = – 2


C13 = 1 C23 = – 10 C33 = 15


adj A =


=


So, adj A =


Now, A – 1 =


(AB) – 1 = B – 1 A – 1



=


Hence, =


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