Q. 55.0( 1 Vote )

If , show that adj A=3AT.

Answer :

A =


Cofactors of A are:


C11 = – 3 C21 = 6 C31 = 6


C12 = – 6 C22 = 3 C32 = – 6


C13 = – 6 C23 = – 6 C33 = 3


adj A =


=


So, adj A =


Now, 3AT = 3


Hence, adj A = 3.AT


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