Question

what are the vertex, focus and directrix of the parabola with equation y=x^2-8x+18?

Answer 1

the equation of a parabola centered at (h,k) with focus (h,k+p) is :
y = 1/(4p) * (x-h)^2 +k

Answer 2

Ahh ok

Answer 3

thanks!

Answer 4

@perl what is your "p" in that formula?

Answer 5

|p| is the distance from the vertex to the focus

Answer 6

thanks