1. The problem statement, all variables and given/known data Find the inverse of by reducing the augmented matrix [A|I] using row operations. 3. The attempt at a solution I just can't seem to get this one out, it's the last in a series of 9 similar questions and the first I am to have a hard time with. First few attempts involved operations like: R1 <- R1 x 1/4 R3 <- R3 + R2 R4 <- R4 + R1 R1 <- R1 - 2R4 But I don't seem to be getting any closer to a solution with the operations that i am trying. Any help, even just a pointer as to what row operations to start off with, would be gratefully appreciated.