Vertex Form
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Vertex
(h, k)
When the Quadratic Functions faces Downward
When a < 0
When the Vertex is a Maximum Point
When a < 0
When the Quadratic Function faces Upward
When a > 0
When the Vertex is a Minimum Point
When a > 0
Vertex Form - Formula for h
h = -b / 2a
Vertex Form - Formula for k
k = (4ac - b²) / 4a
Axis of Symmetry
x = h
Quadratic Function - Vertex Form
y = a(x - h)² + k
Quadratic Functions - Standard Form
y = ax² + bx + c
