Problem with 2nd order polynomial

[Patocuy]

Hi.
I used proot and solve and got the same solutions with both functions, perhaps solve needs to know which variable you are solving for.

UPDATE

Now I used the same syntax as you, without specifying the variable to solve for and got the same solutions as before. You could use purge(x) to be sure that x has no value assigned and check your CAS settings, I have attached mine so you can compare.

Regards