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V-1a y x Uitgevers - WISPLAN · f(3) = 32 – 2 × 3 – 3 = 9 – 6 – 3 = 0, klopt 2c –x – x + 1 = 0 a = –1, b = –1 en c = 1 geeft D = (–1)2 – 4 × –1 × 1 = 1 +
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