# Thread: Getting the equation of a parabola with only the x-intercepts.

1. ## Getting the equation of a parabola with only the x-intercepts.

How do i get the equation of a parabola with on the zeros (30,0) and (20,0)

Thanks

2. Originally Posted by Lolman
How do i get the equation of a parabola with on the zeros (30,0) and (20,0)

Thanks
You will need one more point to determine if there is any stretch/compression and reflection to your parabola. So not enough information.

3. Originally Posted by Lolman
How do i get the equation of a parabola with on the zeros (30,0) and (20,0)

Thanks
You can't get the equation but a family of parabolas:

$p(x)=a (x-20)(x-30) = a(x^2-50x+600)$

The actual form of the parabola depends on the value of a.