none(if y=0) since we use the quadratic equation and we use a calculator we got our answer :D
I think there are actually 2.
You can tell from the discriminant, b^2 - 4ac
If b^2 - 4ac = 0, then there's 1.
If b^2 - 4ac > 0, then there are 2.
If b^2 - 4ac < 0, then there are 0.