| A | B |
|---|
| Parabolas: Form of the Equation (for y) | y = a(x - h) squared + k |
| Parabolas: Form of the Equation (for x) | x = a(y - k) squared + h |
| Parabolas: Axis of Symmetry (for y) | x = h |
| Parabolas: Axis of Symmetry (for x) | y = k |
| Parabolas: Vertex (for y) | (h, k) |
| Parabolas: Vertex (for x) | (h, K0 |
| Parabolas: Focus (for y) | (h, k + 1/4a) |
| Parabolas: Focus (for x) | (h, + 1/4a, k) |
| Parabolas: Directrix (for y) | y = k - 1/4a |
| Parabolas: Directrix (for x) | x = h - 1/4a |
| Parabolas: Direction of Opening (for y) | upward if a > 0 ; downward if a < 0 |
| Parabolas: Direction of Opening (for x) | right if a > 0 ; left if a < 0 |
| Parabolas: Lenght of Latus Rectum (for y) | l 1/a l units |
| Parabolas: Lenght of Latus Rectum (for x) | l 1/a l units |
| Definition of a "Parabola" | 1. The general shape of the graph of a quadratic function. ; 2. The set of all points in a plane that are the same distance from a given point called the focus and a given line called the directrix. |
