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Nightshade

Nightshade is any member of the genus Solanum, many of which are poisonous. The name is also extended to the family Solanaceae.

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... 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, ...