Chapter 12: Problem 58
If \(\log _{b} 3=0.5\) and \(\log _{b} 5=0.7,\) evaluate each expression. See Example 6. $$ \log _{b} \sqrt[4]{3} $$
Short Answer
Expert verified
\(\log_{b} \sqrt[4]{3} = 0.125\).
Step by step solution
01
Identify the Problem
We need to evaluate the logarithm \( \log_{b} \sqrt[4]{3} \) given that \( \log_{b} 3 = 0.5 \) and \( \log_{b} 5 = 0.7 \).
02
Express the Expression in Terms of Known Values
We know \( \sqrt[4]{3} = 3^{1/4} \). Thus, we can express the expression as \( \log_{b} (3^{1/4}) \).
03
Use Logarithm Power Rule
The power rule of logarithms states that \( \log_{b} (x^{y}) = y \log_{b} x \). Applying this, we have \( \log_{b} (3^{1/4}) = \frac{1}{4} \log_{b} 3 \).
04
Substitute Known Values
Substitute the known value \( \log_{b} 3 = 0.5 \) into the expression: \( \frac{1}{4} \log_{b} 3 = \frac{1}{4} \times 0.5 \).
05
Perform the Calculation
Now perform the calculation: \( \frac{1}{4} \times 0.5 = 0.125 \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Logarithm Power Rule
The logarithm power rule is a handy tool when dealing with exponents inside a logarithm. It allows us to simplify expressions by bringing the exponent in front of the logarithm. For example, if you have an expression like \( \log_b(x^y) \), you can use the power rule to rewrite it as \( y \cdot \log_b(x) \). This makes calculations easier.
- This rule can simplify logarithmic expressions, especially when working with fractional or complex exponents.
- Remember, this rule applies to any positive real number as the base.
Logarithm Base Change
Changing the base of a logarithm is a useful technique, particularly when you need to compare or compute logarithms with different bases. The base change formula is:\[ \log_b(a) = \frac{\log_c(a)}{\log_c(b)} \]This formula enables you to switch from base \( b \) to another base \( c \). It's especially helpful when you have access to a calculator that might only work with some bases like 10 or \( e \) (natural logarithms).
- Logarithm base change is beneficial in cases where specific logarithm values are required for computation.
- It transforms expressions to make them compatible with standard calculator functions.
Properties of Exponents
Understanding the properties of exponents is essential when dealing with expressions that involve powers. These properties form a foundation that helps in simplifying both exponential and logarithmic equations. Key properties include:
- \( a^m \times a^n = a^{m+n} \)
- \( (a^m)^n = a^{m \cdot n} \)
- \( a^m \div a^n = a^{m-n} \)
- \( a^0 = 1 \)