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.
... that does not depend on x) to the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is ...