1. The problem statement, all variables and given/known data 2. Relevant equations Inverse of an (nxn) (n=2 only) square matrix: 3. The attempt at a solution The answer provided in the solutions does the exact same thing except, where my ?? are. It does A = BCB^-1. Where as I do A = CBB^-1. When I was doing this question I was wondering the same thing. I know matrix multiplication isnt associative( AB isnt equal to BA), so how do I know which way to form the equations? I mean how am I meant to know whether its meant to be A=CBB^-1 or BCB^-1?