A parabola's axis of symmetry always goes through the vertex of the parabola. In other words, it is a vertical line that goes through the x-coordinate of the vertex. Therefore, the equation of the axis of symmetry for this parabola is x = 0.
The answer should be 6! all you have to do is plug the numbers into the equation! it would be like this: -1^2+3^2+(-1)-3 doing all of that would equal 6!
