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).