1. The problem statement, all variables and given/known data If A and B [tex]\in[/tex] Mn(R) and B is invertible show that l A-cI l = l B-1AB-cI l 2. Relevant equations N/A 3. The attempt at a solution i've no idea how to prove this. can give me any clue? l AI-cI l = l ABB-1-cI l am i in the right way?