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Pemba

Pemba is an island to the north of Zanzibar, off the east coast of Africa in the Indian Ocean.

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Quadratic formula

... that 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 ...