answer this question on adjoint of matrix - Applied Mathematics - Matrices

Question

answer this question on adjoint of matrix

Atul Shaw · Accepted Answer

Dear student,adj(adj A)adj(adj A)=|A|n-2
AA(n-1)2=An-2-(n-1)2 An-2-(n-1)2
=n-2-(n2-2n+1)=n-2-n2+2n-1=-n2+3n-3An-2-(n-1)2 A=A-n2+3n-3
A =RHS 1  adj(adj A)=An-2 A2  |adj(adj
r times(adj A))|=|A|n-2r ARegards