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Evaluating a Logarithm by Converting to Exponential Form

To evaluate a logarithm without a calculator, the expression can be solved by converting it into an equivalent exponential equation. First, set the logarithmic expression equal to a variable, such as xx. Next, change the equation to its exponential form. Then, rewrite the constant term on one side of the equation as a power so that both sides share the exact same base. Because the bases are identical, the exponents must be equal. Finally, set the exponents equal to each other and solve the resulting equation for the variable to determine the exact value of the logarithm.

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Updated 2026-05-25

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Intermediate Algebra @ OpenStax

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

Algebra

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