Stage 23 · Quadratic Functions

23.4.3 Know the Vertex? Use Vertex Form

23.4 Three Forms and How to Find Them

Point 3 of 5

23.4.3 Know the Vertex? Use Vertex Form

Core idea

If you know where the bowl's bottom is plus one more point, plug into y=a(x−h)²+k and solving for a is the easiest path.

Module goal. Master the general, vertex, and factored forms, and find the equation from given conditions by solving for the unknown coefficients.
eastmath.com · 23.4 Three Forms and How to Find Them · 23.4.3 Know the Vertex? Use Vertex Form