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5

Years: 1 BC 1 2 3 4 - 5 - 6 7 8 9 10

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For the number 5, see five.

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... 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, ...