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Researchers found that the relationship between the yield of a crop and the amount of watering could be modelled by y = -1478+3345xt-446x2, where

Researchers found that the relationship between the yield of a crop and the amount of watering could be modelled by y = -1478+3345xt-446x2, where y is the yield, in kilograms per hectare (kg/ha), and x is the annual amount of water, in hectare-metres (ha-m). How much water produces the greatest yield?

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