Ishi (? - 1916) was claimed to be the last California Yahi Indian. He was discovered in 1911 in the foothills near Mt. Lassen. His story was popularized in a book by Theodora Kroeber[?], wife of A.L. Kroeber, who worked with Ishi.
... which are complex numbers. The two solutions are complex conjugates of each other. (In this case, the parabola does not intersect the x-axis at all.)
Note that when ...