Question

What is the vertex form of `y=x^2-4x+9`?

Answer 1

`y-5=(x-2)^2`

Explanation:

The equation of the parabola is

`" "y=x^2-4x+9`

`rArr" "y-5=x^2-4x+4`

`rArr" "y-5=(x-2)^2`

So the parabola is of the form `x^2=4ay` with the vertex at `(2,5)`.