Answer :
A = 
Let B = AT = 
|B| = 
= ( – 1 – 8) – 0 – 2( – 8 + 3) = – 9 + 10 = 1
Cofactors of B are:
C11 = – 9 C21 = 8 C31 = – 5
C12 = – 8 C22 = 7 C32 = – 4
C13 = – 2 C23 = 2 C33 = – 1
adj B = 
= 
So, adj B = 
Now, B – 1 = 
Hence, (AT) – 1 
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RELATED QUESTIONS :
Using matrices, solve the following system of equations:
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