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Ch. 4 - Exponential and Logarithmic Functions
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Blitzer 8th EditionCh. 4 - Exponential and Logarithmic Functions문제 21
5장, 문제 21

Evaluate each expression without using a calculator. log4 16

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1
Recognize that the expression \( \log_4 16 \) asks for the exponent to which the base 4 must be raised to get 16.
Express 16 as a power of 4. Since 16 is \( 4^2 \), rewrite the expression as \( \log_4 (4^2) \).
Use the logarithmic identity \( \log_b (b^k) = k \) to simplify \( \log_4 (4^2) \) to 2.
Conclude that \( \log_4 16 = 2 \) because 4 raised to the power 2 equals 16.
Thus, the value of the logarithm is the exponent 2.

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Logarithm Definition

A logarithm answers the question: to what exponent must the base be raised to produce a given number? For example, log_b(a) = c means b^c = a. Understanding this definition is essential to evaluate logarithmic expressions.
추천 영상:
7:30
Logarithms Introduction

Properties of Exponents

Since logarithms are closely related to exponents, knowing how to express numbers as powers of a base helps simplify logarithms. For instance, recognizing that 16 = 4^2 allows you to rewrite log_4(16) as log_4(4^2).
추천 영상:
가이드 코스
04:06
Rational Exponents

Logarithm Power Rule

The power rule states that log_b(a^n) = n * log_b(a). This property allows you to bring the exponent in the argument down as a multiplier, simplifying the evaluation of logarithms when the argument is a power of the base.
추천 영상:
가이드 코스
5:50
Power Rules
관련 실천
교과서 질문

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교과서 질문

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교과서 질문

In Exercises 19–29, evaluate each expression without using a calculator. If evaluation is not possible, state the reason. log16 4

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교과서 질문

The graph of an exponential function is given. Select the function for each graph from the following options:

f(x)=3x,g(x)=3x−1,h(x)=3x−1,f(x)=−3x,G(x)=3−x,H(x)=−3−x.f(x) = 3^x, \(\quad\) g(x) = 3^{x-1}, \(\quad\) h(x) = 3^x - 1, \(\f\)(x) = -3^x, \(\quad\) G(x) = 3^{-x}, \(\quad\) H(x) = -3^{-x}.

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교과서 질문

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교과서 질문

Solve each exponential equation in Exercises 1–22 by expressing each side as a power of the same base and then equating exponents. e(x+1)=1/e

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