Rewrite Expression Using Change Of Base Formula Worksheet

Algebra 2
Logarithms

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How Will This Worksheet on "Rewrite Expression Using Change of Base Formula" Benefit Your Student's Learning?

  • It helps manage logarithms in different types of math problems and situations.
  • Simplifies logarithmic expressions by changing them to a base that's easier to handle.
  • Improves skills in handling algebra and understanding how logarithms behave.
  • Helps accurately calculate and analyze growth, decay, and other logarithmic functions in math and science.

How to Rewrite Expression Using Change of Base Formula?

  • Start with the given logarithmic expression in a specific base, such as \( \log_b M \).
  • Use the formula `\log_b M = \frac{\log_c M}{\log_c b}`, where \( c \) can be any base different from \( b \).
  • Select \( c \) as a base convenient for the calculation or context, often base `10` (common logarithms) or base `2` (binary logarithms).
  • Substitute the values of \( b \), \( M \), and \( c \) into the formula and simplify if necessary, ensuring the expression of the result clearly in terms of the new base \( c \).

Solved Example

Q. Rewrite as a quotient of two common logarithms. Write your answer in simplest form. log333= \log_3 33 =
Solution:
  1. Apply change of base formula:logba=logcalogcb \log_b a = \frac{\log_c a}{\log_c b} \newline Use the change of base formula for logarithms.\newlineLet's take base of 1010. log333=log10(33)log10(3) \log_{3} 33 = \frac{\log_{10}(33)}{\log_{10}(3)}
  2. Simplify the expression: Simplify the expression.\newline log333=log10(33)log10(3) \log_{3} 33 = \frac{\log_{10}(33)}{\log_{10}(3)}
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About Worksheet

Algebra 2
Logarithms

The change of base formula lets us rewrite a logarithm from one base to another. It's done using the formula: `\log_b M = \frac{\log_c M}{\log_c b}`, where \( b \), \( M \), and \( c \) are positive numbers (not `1`). This is useful for converting logarithms, especially when using common logarithms (base `10`) for easier calculations and applications in various fields.
Example: Rewrite \( \log_3 8 \) using base `2` logarithms.

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