Answer:
it depends
Step-by-step explanation:
You want to know where to look for the axis of symmetry.
Axis of symmetry
The axis of symmetry is a line such that reflecting the graph over the line maps the graph to itself. Whether it is a vertical line, a horizontal line, or some other line depends on the figure being considered.
X-intercepts
An even number of x-intercepts, if there are any, will be symmetrical about a vertical axis of symmetry. These are shown as blue dots symmetrical about the blue dashed line in the attachment.
For even-degree polynomial functions, the vertical axis of symmetry can be located by looking at the extrema. If there are more than one, the axis of symmetry passes through the middle one. If there is only one, it lies on the axis of symmetry.
Y-intercepts
An even number of y-intercepts, if there are any, will be symmetrical about a horizontal axis of symmetry. These are shown as red dots symmetrical about the red dashed line in the attachment.
