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Nihon Keizai Shimbun

Nihon Keizai Shimbun (日本経済新聞) is a leading financial newspaper in Japan. It is often called by a shorthand "Nikkei". It measures Nikkei 225.

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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, ...