Jin Ke (荊軻 pinyin jin1 ke1) was a guest residing in the estates of Dan, crown prince of Yan[?] and renowned for his failed assassination of the Chinese emperor Qin Shi Huang Di.
... square of b/(2a) to both sides, getting
<math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math>
The left side is now a perfect ...