Parabolas
Parabolas
Opens Horizontally
The equation of a parabola with vertex at (h, k) that opens in the "x-direction" is x = a(y - k)2 + h. The direction of opening is determined by the value of a. If a < 0, it will open to the left. If a > 0, it will open to the right. These parabolas will have the following properties:
Focus: 
Directrix: 
Axis of symmetry: 