1. The problem statement, all variables and given/known data 2. Relevant equations determinant is the product of the eigenvalues... so -1.1*2.3 = -2.53 det(a−1) = 1 / det(A), = (1/-2.53) =-.3952 3. The attempt at a solution If it's asking for a quality of its inverse, it must be invertible. I did what I showed above, but my answer was incorrect.