# Thread: Parabola help

1. ## Parabola help

X=1/2 (y+3)^2 +1

Center I got (1,-3). And p= 1/2? Or no? And focus= (1 1/2,-3) and directrix of x= 1/2? Or is p wrong and I messed everything up?

2. ## Re: Parabola help

The focus and directrix are correct, but p = 1. Oh, and the term is vertex, not center. 3. ## Re: Parabola help

Please explain how p=1. I don't know how I got correct focus and directrix if i used 1/2 as p. I believe you are correct just not sure how. I am terrible at math

4. ## Re: Parabola help

p = 2f = 2(1/2) = 1. Perhaps you are confusing p and f?

5. ## Re: Parabola help

Sorry still don't follow. What is f? What does it stand for?

6. ## Re: Parabola help

f is the distance between the focus and the vertex.

7. ## Re: Parabola help

That is what I thought but if p=1 wouldn't focus be (2,-3) and directrix be x=0?

8. ## Re: Parabola help

Sorry nevermind. I just don't know how I got correct focus and directrix using p=1/2. I thought if p=1 then equation would be
X=1/4 (y+3)^2+1