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Expand: [tex]\log \left(\frac{\sqrt[5]{x}}{y}\right)[/tex]

A. [tex]\frac{1}{5} \log x + \log y[/tex]

B. [tex]\log \sqrt[5]{x} - \log y[/tex]

C. [tex]\frac{1}{5} \log x - \log y[/tex]


Sagot :

To expand the expression [tex]\(\log \left(\frac{\sqrt[5]{x}}{y}\right)\)[/tex], we will use the properties of logarithms. Specifically, we will use the quotient rule and the power rule.

### Steps:

1. Quotient Rule:
The logarithm of a quotient is the difference of the logarithms.
[tex]\[ \log \left(\frac{a}{b}\right) = \log a - \log b \][/tex]
Applying this to [tex]\(\log \left(\frac{\sqrt[5]{x}}{y}\right)\)[/tex]:
[tex]\[ \log \left(\frac{\sqrt[5]{x}}{y}\right) = \log (\sqrt[5]{x}) - \log (y) \][/tex]

2. Power Rule:
The logarithm of a power is the exponent times the logarithm of the base.
[tex]\[ \log (a^b) = b \log a \][/tex]
Applying this to [tex]\(\log (\sqrt[5]{x})\)[/tex]:
[tex]\(\sqrt[5]{x}\)[/tex] can be written as [tex]\(x^{1/5}\)[/tex]. Therefore:
[tex]\[ \log (\sqrt[5]{x}) = \log (x^{1/5}) = \frac{1}{5} \log (x) \][/tex]

3. Combine Results:
Substitute this result back into the first expression we got:
[tex]\[ \log \left(\frac{\sqrt[5]{x}}{y}\right) = \frac{1}{5} \log (x) - \log (y) \][/tex]

### Conclusion:
The expanded form of [tex]\(\log \left(\frac{\sqrt[5]{x}}{y}\right)\)[/tex] is:
[tex]\[ \boxed{\frac{1}{5} \log x - \log y} \][/tex]

Thus, the correct option from the given choices is:
[tex]\[ \frac{1}{5} \log x - \log y \][/tex]
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