S.P. Korolev Rocket and Space Corporation Energia is a Russian manufacturer of spacecraft and space station components. It is named after Sergey Korolev and has been known successively as: Special Design Bureau number 1, TsKBEM, NPO Energia and S.P. Korolev RSC Energia.
... 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different cases:
If the discriminant is zero, then there ...