If log 3 = A and log 7 = B, find log7 (9) in terms of A and B.
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6. Exponential & Logarithmic Functions
Properties of Logarithms
Multiple Choice
Write the single logarithm as a sum or difference of logs.
log5(x35(2x+3)2)
A
5+2log5(2x+3)−log53x
B
2log5(2x+3)−3log5x
C
1+2log5(2x+3)−3log5x
D
log5(2x+3)−log5x
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Verified step by step guidance1
Start by applying the properties of logarithms to the given expression: \( \log_5\left(\frac{5(2x+3)^2}{x^3}\right) \). The logarithm of a quotient can be expressed as the difference of two logarithms: \( \log_5(a/b) = \log_5(a) - \log_5(b) \).
Apply the quotient rule: \( \log_5\left(\frac{5(2x+3)^2}{x^3}\right) = \log_5(5(2x+3)^2) - \log_5(x^3) \).
Next, apply the product rule to the first term: \( \log_5(5(2x+3)^2) = \log_5(5) + \log_5((2x+3)^2) \). The product rule states that \( \log_5(ab) = \log_5(a) + \log_5(b) \).
Now, apply the power rule to the term \( \log_5((2x+3)^2) \): \( \log_5((2x+3)^2) = 2\log_5(2x+3) \). The power rule states that \( \log_5(a^b) = b\log_5(a) \).
Finally, apply the power rule to the term \( \log_5(x^3) \): \( \log_5(x^3) = 3\log_5(x) \). Combine all the terms: \( \log_5(5) + 2\log_5(2x+3) - 3\log_5(x) \). Since \( \log_5(5) = 1 \), the expression simplifies to \( 1 + 2\log_5(2x+3) - 3\log_5(x) \).
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