SOLUTION: Which of the following are true about the parabola with equation x2=12y? Choose all that apply: The focus is (0,3). The directrix is y=-3. The focus is (0,-3). The ver

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: Which of the following are true about the parabola with equation x2=12y? Choose all that apply: The focus is (0,3). The directrix is y=-3. The focus is (0,-3). The ver      Log On


   



Question 658020: Which of the following are true about the parabola with equation x2=12y? Choose all that apply:
The focus is (0,3).
The directrix is y=-3.
The focus is (0,-3).
The vertex is (0,0).

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
Note: vertex form of a Parabola opening up(a>0) or down(a<0), y=a%28x-h%29%5E2+%2Bk
where(h,k) is the vertex and x = h is the Line of Symmetry
The standard form is %28x+-h%29%5E2+=+4p%28y+-k%29, where the focus is (h,k + p)
x%5E2=12y , V(0,0), 4p = 12, p = 3, F(0,3) and directrix is y = -3