Parabola OPENS DOWN
Parabola vertex at (0,0)
Opens DOWN when a <0 Axis of Symmetry x = 0 Y Intercept (0,0) X Intercept (0,0) Directrix Line y = -p Focus (0,p) Domain: All real x Range: all y < 0 |
Parabola vertex at (h,k)
Opens DOWN when a <0 Axis of Symmetry x = h Directrix Line y = k-p Focus (h,k+p) Domain: All real x Range: all y < k |