# I get to a dead end with the 5th part

1. Feb 6, 2008

### transgalactic

Last edited: Feb 6, 2008
2. Feb 6, 2008

### HallsofIvy

Staff Emeritus

You are given that A2- A= -I for linear transformation A and you are asked to find A-1. In your solution you multiply both sides by A-1 (as I had suggested before) and get A- I= -A-1. Then you do a lot of things that I don't understand.

Just multiply on both sides by -1 to get A-1= I- A. What more do you want?

3. Feb 6, 2008