Question

Wht equation describes a parabola that opens up or down and whos vertex is at the point (h,v)

Answer 1

`f(x)=a(x-h)^2+k`

Vertex form.

Explanation:

You are talking about the vertex form for a parabola.

`f(x)=a(x-h)^2+k` tells us:

A) The vertex is (h,k).

B) Open up (if a is positive) or open down (if a is negative)

C) a also tells us how much it is vertically stretched or compressed.