In Exercises 1–40, use properties of logarithms to expand each logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator. log(1000x)
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Properties of Logarithms
Problem 8
Textbook Question
Answer each of the following. Between what two consecutive integers must log2 12 lie?
Verified step by step guidance1
Recall that \( \log_2 12 \) means the exponent to which 2 must be raised to get 12.
Identify powers of 2 that are close to 12. For example, \( 2^3 = 8 \) and \( 2^4 = 16 \).
Since 12 is between 8 and 16, \( \log_2 12 \) must be between 3 and 4 because \( 2^3 < 12 < 2^4 \).
Therefore, the two consecutive integers between which \( \log_2 12 \) lies are 3 and 4.
This means \( 3 < \log_2 12 < 4 \).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Logarithms and Their Meaning
A logarithm answers the question: to what exponent must the base be raised to produce a given number? For example, log₂12 asks for the power to which 2 must be raised to get 12. Understanding this helps in estimating or calculating logarithmic values.
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Logarithms Introduction
Properties of Logarithms
Logarithms have properties such as log_b(mn) = log_b(m) + log_b(n), which can simplify calculations. Recognizing that 12 lies between powers of 2 (like 8 and 16) helps estimate log₂12 by comparing it to known integer logarithms.
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Change of Base Property
Estimating Logarithmic Values Using Consecutive Integers
To find between which two integers a logarithm lies, identify consecutive powers of the base that bracket the number. Since 2³ = 8 and 2⁴ = 16, and 12 is between 8 and 16, log₂12 must lie between 3 and 4.
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Graphs of Logarithmic Functions
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