Question: Given A - 1 = [ a b c d ] and det ( A - 1 ) = 3 . Find the matrix A

Given A-1=[abcd] and det(A-1)=3. Find the matrix A.
please include all the steps and the explainations. Thank you.
Given A - 1 = [ a b c d ] and det ( A - 1 ) = 3 .

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