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1420

Centuries: 14th century - 15th century - 16th century

Decades: 1370s 1380s 1390s 1400s 1410s - 1420s - 1430s 1440s 1450s 1460s 1470s

Years: 1415 1416 1417 1418 1419 - 1420 - 1421 1422 1423 1424 1425

Events

May 21 - Treaty of Troyes[?]. With the Burgundian faction dominant in France, King Charles VI of France acknowledges Henry V of England as his heir and as virtual ruler of most of France.
May 25 - Henry the Navigator is appointed governor of the Order of Christ.

Births

Deaths

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Quadratic formula

... 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) to both ...