Multiple Choice

A production manager uses the formula E=x2+8x+7x24E = \frac{x^2+8x+7}{x^2-4} to calculate a machine's efficiency index, where xx represents the deviation from the standard operating speed. According to this model, what is the efficiency index EE when the machine is operating exactly at the standard speed (x=0x = 0)?

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Updated 2026-04-20

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