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Ch. 4 - Exponential and Logarithmic Functions
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Capitolo 5, Problema 35

Evaluate each expression without using a calculator. log5 5

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1
Recall the definition of a logarithm: \(\log_b a = c\) means that \(b^c = a\).
In this problem, we have \(\log_5 5\), which asks: "To what power must 5 be raised to get 5?"
Since \(5^1 = 5\), the exponent that satisfies this equation is 1.
Therefore, \(\log_5 5 = 1\) because the base and the argument are the same.
This is a general property of logarithms: \(\log_b b = 1\) for any positive base \(b \neq 1\).

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Definition of Logarithms

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.
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Logarithms Introduction

Logarithm of a Base to Itself

The logarithm of a base raised to itself, such as log_b(b), always equals 1 because the base raised to the power 1 equals itself. This property simplifies expressions like log5 5 directly to 1.
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Logarithms Introduction

Properties of Logarithms

Logarithms follow specific properties, such as log_b(b^x) = x and log_b(1) = 0. Recognizing these properties helps in simplifying and evaluating logarithmic expressions without a calculator.
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Change of Base Property
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