# How do I use the vertex formula to determine the vertex of the graph for #-3x^2+12x-9#?

##### 2 Answers

Vertex form:

x of vertex:

y of vertex: f(-2) = -12 + 24 - 9 = 3

Vertex form:

Check by developing:

May 18, 2015

For

For

Therefore, the vertex formula gives us

We still need the

The vertex is

graph{y=-3x^2+12x-9 [-10, 10, -5, 5]}