Answer :

Given,



We know that A-1 is given as: if |A| ≠ 0


|A| =


A is invertible; now we can proceed to find the adj(A)


Adj(A) = transpose of co-factor matrix of A.


Adj(A) =


We can observe by comparing A and adj(A) that:


Adj(A) = -A


A-1 =


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