We are going to make the following definitions: Symmetry axis: Is the axis that divides the quadratic function into equal parts. Intersection with the y axis: is the point of the graph (or table) whose coordinate x is equal to zero. We have then:
For f (x): Symmetry axis: x = 2 Intersection with y axis: (0, 6)
For g (x): Symmetry axis: x = 2 Intersection with y axis: (0, 8)