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Example 10.34: Expanding a Logarithm with a Radical

To expand a logarithmic expression containing a radical, such as log2x33y2z4\log_2\sqrt[4]{\frac{x^3}{3y^2z}}, first rewrite the radical with a rational exponent, resulting in log2(x33y2z)14\log_2\left(\frac{x^3}{3y^2z}\right)^{\frac{1}{4}}. Next, apply the properties of logarithms systematically. Use the Power Property, logaMp=plogaM\log_a M^p = p \log_a M, to bring the rational exponent to the front: 14log2(x33y2z)\frac{1}{4}\log_2\left(\frac{x^3}{3y^2z}\right). Then, apply the Quotient Property to separate the numerator and denominator: 14(log2(x3)log2(3y2z))\frac{1}{4}(\log_2(x^3) - \log_2(3y^2z)). Use the Product Property to expand the terms in the denominator: 14(log2(x3)(log23+log2y2+log2z))\frac{1}{4}(\log_2(x^3) - (\log_2 3 + \log_2 y^2 + \log_2 z)). Apply the Power Property again inside the parentheses: 14(3log2x(log23+2log2y+log2z))\frac{1}{4}(3\log_2 x - (\log_2 3 + 2\log_2 y + \log_2 z)). Finally, simplify by distributing the negative sign to obtain the fully expanded expression: 14(3log2xlog232log2ylog2z)\frac{1}{4}(3\log_2 x - \log_2 3 - 2\log_2 y - \log_2 z).

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Updated 2026-05-25

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

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