The Axis of Symmetry of the Graphs of Quadratic Functions is the curve symmetrical (mirror image) to the axis that passes through x=h. Based from what you have learned, what does the value of "h" shows us?
The axis of symmetry is the vertical line that goes through the vertex of a parabola so the left and right sides of the parabola are symmetric. To simplify, this line splits the graph of a quadratic equation into two mirror images.