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One-to-One Property of Logarithmic Equations

The One-to-One Property of Logarithmic Equations states that if the logarithms of two positive quantities with the same base are equal, then the quantities themselves must be equal. Formally, for M>0M > 0, N>0N > 0, a>0a > 0, and aeq1a eq 1, if logaM=logaN\log_a M = \log_a N, then M=NM = N. This property is a fundamental tool for solving logarithmic equations that have a single logarithmic expression with identical bases on both sides. To use this property, it is critical to ensure both sides are written with the same base. Furthermore, because logarithms are only defined for positive real numbers, any resulting solutions must be checked in the original equation to identify and eliminate extraneous solutions that would result in taking the logarithm of zero or a negative number.

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Updated 2026-05-26

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Ch.10 Exponential and Logarithmic Functions - Intermediate Algebra @ OpenStax

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