Graphing Quadratic Functions Using Vertex Form and Intercept Form
Concept

Vertex of a Parabola

Because a parabola either opens upward or downward, there is always one point that is the absolute maximum or absolute minimum of the function. This point is called the vertex.
vertex of a parabola showing maximum or minimum button animation
At the vertex, the function changes from increasing to decreasing, or vice versa.
Exercises
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