Vertex Form

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