1. The problem statement, all variables and given/known data Show that a matrix with a row of zeros cannot have an inverse. 3. The attempt at a solution I believe that I have to use the definition of invertible to do this. If A is an nxn matrix and there exists some matrix B such that AB = BA = I where I is the identity. I would just like a hint here. Is there some other definition that I should be using here as well? I feel like I should be using the definition of matrix multiplication as well. Thanks.