Every quadratic equation have no more than two solutions.
If a polynomial equation have at least one complex solution, the its correspondent conjugate must also be a solution. Therefore, if any polynomial equation have polynomial solutions, they are agrouped in a even number.
Now, considering these concepts, if a quadratic equation have one solution -5/3, the following statemens are true:
- -There are no complex solutions.
- There is exactly one more real solution (Here, we are considering that this another solution can be equal to -5/3)