Math Problem Statement

Supposed log5(6)=a and log5(11)=b. Use the change-of-base formula along with properties of logarithms to rewrite the expression in terms of a and b

. Show the steps for solving. log11(6)

Solution

We are tasked with expressing log11(6)\log_{11}(6) in terms of aa and bb, where log5(6)=a\log_5(6) = a and log5(11)=b\log_5(11) = b.

To solve this, we'll use the change-of-base formula and logarithmic properties. Here's a step-by-step breakdown:

Step 1: Apply the Change-of-Base Formula

The change-of-base formula is:

logc(x)=logb(x)logb(c)\log_c(x) = \frac{\log_b(x)}{\log_b(c)}

In this case, we need to express log11(6)\log_{11}(6) in terms of base 5, since we have information about logarithms in base 5. Using the change-of-base formula:

log11(6)=log5(6)log5(11)\log_{11}(6) = \frac{\log_5(6)}{\log_5(11)}

Step 2: Substitute the Known Values

We are given that:

  • log5(6)=a\log_5(6) = a
  • log5(11)=b\log_5(11) = b

Substitute these into the equation:

log11(6)=ab\log_{11}(6) = \frac{a}{b}

Final Answer:

Thus, log11(6)\log_{11}(6) can be rewritten as:

log11(6)=ab\log_{11}(6) = \frac{a}{b}

Explanation:

This result follows directly from the change-of-base formula and the properties of logarithms. By expressing log11(6)\log_{11}(6) in terms of logarithms with base 5, we can utilize the values of aa and bb to represent the result.


Would you like more details on this solution, or have any questions?

Relative Questions:

  1. How can we apply the change-of-base formula to other logarithmic bases?
  2. What happens if we want to convert from base 10 to base 5 using the change-of-base formula?
  3. How does the property logb(xy)=logb(x)+logb(y)\log_b(xy) = \log_b(x) + \log_b(y) affect solving such problems?
  4. Can you prove the change-of-base formula using the definition of logarithms?
  5. How can logarithmic properties simplify complex logarithmic expressions?

Tip:

Whenever you need to change the base of a logarithm, the change-of-base formula is an essential tool. Keep it handy for converting between different bases easily!

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Math Problem Analysis

Mathematical Concepts

Logarithms
Change-of-Base Formula
Logarithmic Properties

Formulas

log_c(x) = log_b(x) / log_b(c)

Theorems

Change-of-Base Theorem

Suitable Grade Level

Grades 10-12