Simplify $\frac{\log{\sqrt{a}}}{\log{a}} \times \frac{\log{\sqrt[3]{5}}}{\log{\sqrt{5}}}$

Question image

Understand the Problem

The question is asking to simplify a logarithmic expression. We can approach this problem by applying logarithm properties such as the power rule and the change of base formula to simplify the expression.

Answer

$\frac{1}{3}$
Answer for screen readers

$\frac{1}{3}$

Steps to Solve

  1. Simplify the first fraction

Using the power rule of logarithms, we can simplify the numerator $\log{\sqrt{a}}$ as $\log{a^{\frac{1}{2}}}$ which equals $\frac{1}{2}\log{a}$. Thus, the first fraction becomes: $$ \frac{\log{\sqrt{a}}}{\log{a}} = \frac{\frac{1}{2}\log{a}}{\log{a}} = \frac{1}{2} $$

  1. Simplify the second fraction Similarly, we apply the power rule to the second fraction's numerator and denominator: $\log{\sqrt[3]{5}} = \log{5^{\frac{1}{3}}} = \frac{1}{3}\log{5}$ and $\log{\sqrt{5}} = \log{5^{\frac{1}{2}}} = \frac{1}{2}\log{5}$. Thus the second fraction simplifies to: $$ \frac{\log{\sqrt[3]{5}}}{\log{\sqrt{5}}} = \frac{\frac{1}{3}\log{5}}{\frac{1}{2}\log{5}} = \frac{\frac{1}{3}}{\frac{1}{2}} = \frac{1}{3} \times \frac{2}{1} = \frac{2}{3} $$

  2. Multiply the simplified fractions Now, we multiply the simplified fractions: $$ \frac{1}{2} \times \frac{2}{3} = \frac{1 \times 2}{2 \times 3} = \frac{2}{6} $$

  3. Further simplification We simplify the resulting fraction to its simplest form: $$ \frac{2}{6} = \frac{1}{3} $$

$\frac{1}{3}$

More Information

The power rule of logarithms is essential in simplifying expressions with radicals inside logarithms. This rule states that $\log{a^b} = b\log{a}$.

Tips

A common mistake is not correctly applying the power rule of logarithms, especially when dealing with fractional exponents representing roots. For example, confusing $\sqrt{a}$ with $a^2$ or incorrectly simplifying $\frac{\frac{1}{3}}{\frac{1}{2}}$. Another common mistake is to think that $\frac{\log{\sqrt[3]{5}}}{\log{\sqrt{5}}}$ is equal to $\sqrt[3]{5} / \sqrt{5}$.

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