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## Homework Statement

Given one root of the equation, find the others.

a

^{3}-3a

^{2}+a+5=0

Given root: 2-i

## 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.