Centuries: 1st century BC - 1st century - 2nd century
Decades: 20s - 30s - 40s - 50s - 60s - 70s - 80s - 90s - 100s - 110s - 120s
70 71 72 73 74 75 76 77 78 79
Siginificant People
... 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, ...