The monthly output at the Olek Carpet Mill is Q(x) = 15,000 + 2x² units, (40 ≤ x ≤ 60) where x is the number of workers employed at the mill. If there are currently 44 workers, find the instantaneous rate of change of monthly output with respect to the number of workers. That is, find Q'(44). Q'(44) =

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