If the zeros of the quadratic function f, are - 3 and 5, what is the equation of the axis of symmetry of F?

The axis of symmetry of a quadratic function is a vertical line smack in the middle between the two zeroes.

Thus, for a quadratic function with zeroes at - 3 and 5, the equation of the axis of symmetry is

x = (-3+5) / 2=1, or

x=1