Accirding to the MBTI, P's will get a strange uneasy vibe when they meet a J because they sense that J wants to impose order upon them.
... it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...