Multiple Choice

A retail manager uses the quadratic equation y=x2+2x8y = x^2 + 2x - 8 to model the daily staffing costs (yy) relative to the number of checkout lanes open (xx). To find the specific number of lanes that results in the absolute minimum cost, the manager must first identify the axis of symmetry. Which algebraic formula is used to calculate the xx-coordinate of the axis of symmetry?

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Updated 2026-04-21

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