Find the equation of the axis of symmetry for the parabola y=x^2 +3

For a quadratic function in standard form, y = a x 2 + b x + c , the axis of symmetry is a vertical line x = − b 2 a . Example 1:Find the axis of symmetry of the parabola shown. The x -coordinate of the vertex is the equation of the axis of symmetry of the parabola.

B? ? i'm most likely wrong but i think it would be b

I'm gonna have to say about 13 percent