The vertex is the lowest or highest point (depending on direction) on the graph of a quadratic function. Basically you will find the x value of the vertex first and then just plug that value into the function to get the y or functional value of the vertex. Vertex = (h, k).
What Is the Top of a Curve Called?
A curve is a line that bends, usually due to the force of gravity. The top of a curve is the highest point on the curve. The top of a curve is also called the crest of a curve.
The crest of a curve is the point on the curve where the line changes direction. The top of a curve is the point on the curve where the line is the steepest.