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Sia

源's Question
Math
Posted 10 months ago
Express 5 log7 x − 2 log7 y + log7 xy as a single logarithm
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Answer from Sia
Posted 10 months ago
Solution by Steps
step 1
Use the properties of logarithms to combine terms: 5log7(x)2log7(y)+log7(xy)5 \log_7(x) - 2 \log_7(y) + \log_7(xy) can be rewritten using the power rule and product rule for logarithms
step 2
Apply the power rule: 5log7(x)5 \log_7(x) becomes log7(x5)\log_7(x^5) and 2log7(y)-2 \log_7(y) becomes log7(y2)-\log_7(y^2)
step 3
Apply the product rule: log7(x5)+log7(xy)\log_7(x^5) + \log_7(xy) becomes log7(x5xy)\log_7(x^5 \cdot xy)
step 4
Combine the terms: log7(x5xy)log7(y2)\log_7(x^5 \cdot xy) - \log_7(y^2) becomes log7(x5xyy2)\log_7\left(\frac{x^5 \cdot xy}{y^2}\right)
step 5
Simplify the expression: log7(x5xyy2)\log_7\left(\frac{x^5 \cdot xy}{y^2}\right) simplifies to log7(x6y)\log_7\left(\frac{x^6}{y}\right)
Answer
log7(x6y)\log_7\left(\frac{x^6}{y}\right)
Key Concept
Logarithm Properties
Explanation
The power rule for logarithms states that alogb(c)=logb(ca)a \log_b(c) = \log_b(c^a), and the product rule states that logb(c)+logb(d)=logb(cd)\log_b(c) + \log_b(d) = \log_b(cd). These properties are used to combine multiple logarithmic terms into a single logarithm.

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