1. The problem statement, all variables and given/known data If I have the characteristic equation: -λ3 + 3λ2 + 9λ + 5 And I'm told that one of its eigenvalues is -1. How do I find the rest of the eigenvalues? 2. Relevant equations -λ3 + 3λ2 + 9λ + 5 3. The attempt at a solution The furthest I can get is: -λ3 + 3λ2 + 9λ + 5 = (λ + 1) x (some factor of the original characteristic equation) I can't seem to figure out what "some factor of the original characteristic equation" is. I tried it by inspection and I don't see how (λ + 1) helps. Is there some method that I'm missing to find that part?