Question

How do you write `y= - 0.05x^2 + 12.8` into vertex form?

Answer 1

It is nearly in vertex form already, but you could write:

`y = -0.05(x-0)^2+12.8`

The vertex is at `(0, 12.8)`

Explanation:

Vertex form is:

`y = a(x-x_0)^2 + y_0`

where `a` is some non-zero constant (positive or negative) and `(x_0, y_0)` is the vertex.