1940 - Winter War: Finland signs a harsh peace treaty with the Soviet Union, ceeding almost all of Karelia. Finnish troops and remaining population were immediately evacuated.
... to the left of "=", 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 ...