In Polynesian mythology, the Ponaturi are a group of spirits who killed Hema. In revenge, they were locked in a house by Hema's wife, Urutonga, and their sons, Tawhaki and Karihi, until the sun came up. The doors were flung open and the Ponaturi died at contact with sunlight.
... of each other. (In this case, the parabola does not intersect the x-axis at all.)
Note that when computing roots numerically, the usual form of the quadratic ...