1. The problem statement, all variables and given/known data A square matrix A satisfies the matrix equation A3-3A2+7A-2I=0. If A-1 exists, find an expression for A-1 in terms of A and I 2. Relevant equations 3. The attempt at a solution I just multiplied the matrix equation by A-1 and then rearranged to get 2A-1 =3A-7I-A2 Is it that easy? Or is there something that I am missing?