She married the actor Christopher Guest in 1984. She became Lady Haden-Guest of Saling when her husband inherited the Barony in 1996.
Filmography
... that will make 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) ...