Multiple Choice

An inventory management system uses logarithmic equations to model supply chain delays. A logistics coordinator is solving the equation log2x+log2(x2)=3\log_2 x + \log_2(x-2) = 3 to find a potential time delay, xx. After condensing the logs, converting the equation to exponential form, and factoring the resulting quadratic expression, they identify two potential mathematical solutions: x=4x = 4 and x=2x = -2. Which of the following rules must the coordinator recall to determine the valid final answer?

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Updated 2026-05-21

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