Abida - or Abi'dah, father of knowledge; knowing, one of the five sons
of Midian, who was the son of Abraham by Keturah[?] (1 Chr. 1:33),
and apparently the chief of an Arab tribe.
... expresses the explicit solution(s) x to the quadratic equation
<math>ax^2+bx+c=0</math>
in terms of the coefficients a, b and c, which are assumed to be ...