What is the line of symmetry for the parabola whose equation is y = -x2 + x + 3?

Alright so if I do remember my math correctly, this is how it goes:

- y = -x^2 + x + 3

- x = -b/2a

- x = -1/2(-1)

- x = -1/-2, which = (1/2)

Not quite sure if this was correct, but if it was, hope this helps and you're welcome! :)

Wish i could u but i just don’t know the answer