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Vertex of A Parabola. Explained with pictures and illustrations. The formula for the vertex is just
Vertex of a Parabola
The vertex of a parabola is the highest or lowest point, also known as the maximum or minimum of a parabola.
Vertex Properties
is the maximum or minimum value of the parabola (see picture below)
is the turning point of the parabola
the axis of symmetry intersects the vertex (see picture below)
The x-coordinate of the vertex can be found by the formula $$ \frac{-b}{2a}$$, and to get the y value of the vertex, just substitute $$ \frac{-b}{2a}$$, into the the equqation as shown in the diagram and example below: