# Given</span

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

=

Now, A – 1 =

(AB) – 1 = B – 1 A – 1

=

Hence, =

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