Q. 43

If A is an invertible matrix and A-1 = then A=?
A.

B.

C.

D.None of these

Answer :

y property of inverse

(A-1)-1 = A


(A-1)-1 =-1


A =-1 ------------ 1


-1 = 3 x 6 – 4 x 5


-2


C11 = 6 C12 = -5


C21= -4 C22 = 3


Cofactor matrix A =


Adj A =


-1 =


=


Putting in 1


A =

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