It's the common point of two rays.
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Do you have a specific vertex fraction? vertex = -b/2a wuadratic = ax^ + bx + c
when the function is in vertex form: y = a(x - h)2 + k, the point (h, k) is the vertex.
A vertex is the highest or lowest point in a parabola.
A vertex is a point where two or more lines meet.
They form a vertex.