1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Parabola Problem

  1. Aug 30, 2005 #1
    Given {x | -50 < x < 50}, {y | 0 < y < 20} vertex at (0,20) it is a parabola find the equation in (x-h)^2=4p(y-k)

    its pretty easy except how do i find p?
  2. jcsd
  3. Aug 31, 2005 #2


    User Avatar
    Science Advisor

    The information you given isn't enough- I assume you mean a parabola with vertical line of symmetry, vertex at (0, 20), and such that when x=50, y= 0.
    (From {x|-50< x< 50}, {y|0< y< 20}, my first guess was x= 50, y= 20 but then I saw that the vertex was at y= 20 so the parabola must be opening downward.)

    Since you only ask about p, I assume you understand that since the vertex is at (0, 20), the equation is (x- 0)2= 4p(y- 20). Now, put x= 50, y= 0 in that and solve for p.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook