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.