The answer depends on the vertex of WHAT!
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The vertex is at the origin of coordinates ... the point (0, 0).
0 vertex edges and 1 base.
(0, 0), of course. No linear term.
By inspection you should be able to see that this is a parabola with a vertex of this. (0, 0) There is no form for this function as there is no linear term.
The vertex is at the point (0, 4).