Algebra 1 · Quadratic Functions
Vertex Form
Algebra 1 · Quadratic Functions
Definition
Vertex form is the quadratic y = a(x - h)^2 + k, which reveals the vertex (h, k).
Examples
- y = (x - 2)^2 + 1 has vertex (2, 1).
- y = -(x + 3)^2 - 4 has vertex (-3, -4).
Key rule
Read the vertex (h, k) straight from the equation.
Memory hook
Vertex form hands you the vertex (h, k).