1. The problem statement, all variables and given/known data Given one root of the equation, find the others. a3-3a2+a+5=0 Given root: 2-i 3. The attempt at a solution I know the answers, which are 2+i and -1. And I understand how to get the 2+i since when you square root anything, the answer can be positive or negative, but I have no idea where the -1 came from, or how to really solve the problem.