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Evaluating log⁡51\log_5 1 and log⁡77\log_7 7

Evaluate each logarithmic expression using the basic properties of logarithms. ⓐ To evaluate log⁡51\log_5 1, apply the property log⁡a1=0\log_a 1 = 0. Since 55 is a valid base (5>05 > 0 and 5≠15 \neq 1), the expression evaluates directly to 00. Therefore, log⁡51=0\log_5 1 = 0. ⓑ To evaluate log⁡77\log_7 7, apply the property log⁡aa=1\log_a a = 1. Since the argument equals the base, the result is 11. Therefore, log⁡77=1\log_7 7 = 1.

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Updated 2026-06-28

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Intermediate Algebra @ OpenStax

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

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