what is vertex form in algebra
Completing the Square: Finding the Vertex (page 1 of 2) The vertex form of a quadratic is given by. y = a(x â h)2 + k, where (h, k) is the vertex. The a in the vertex form is the same a as. in y = ax2 + bx + c (that is, both a's have exactly the same value). The sign on a tells you whether the quadratic opens up or opens down.