The Ruchnoi Pulemet Kalashnikova obraztsa 1974g (RPK-74, Russian: Kalashnikov Handheld Machine Gun model 1974) is a squad automatic weapon or SAW developed by the Kalashnikov Design Bureau[?] of the Soviet Union in 1974. It is a light machine gun that shoots 5.45×39mm ammunition, and is very similar to the AK74[?], though with a heavier, longer barrel, a bipod and and some differences in the stock and fore-stock.
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If the discriminant is negative, then there are two different solutions x, both of which are complex numbers. The two solutions are ...