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Ch. 4 - Exponential and Logarithmic Functions
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514당신이 사용하는 게 아니라요?교과서 변경
5장, 문제 93

Evaluate or simplify each expression without using a calculator. eln 125

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1
Recognize that the expression involves the natural exponential function and the natural logarithm: \(e^{\ln 125}\).
Recall the property of logarithms and exponentials that states \(e^{\ln x} = x\) for any positive \(x\).
Apply this property directly to simplify \(e^{\ln 125}\) to just \(125\).
Understand that this simplification works because the exponential function and the natural logarithm are inverse functions.
Therefore, the expression \(e^{\ln 125}\) simplifies to \(125\) without any further calculation.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Properties of Logarithms and Exponents

Understanding how logarithms and exponents interact is essential. Specifically, the natural logarithm function ln(x) is the inverse of the exponential function e^x, meaning e^(ln a) = a for any positive number a.
추천 영상:
5:36
Change of Base Property

Natural Logarithm (ln)

The natural logarithm ln(x) is the logarithm to the base e, where e is approximately 2.718. It answers the question: to what power must e be raised to get x? This concept is fundamental when simplifying expressions involving e and ln.
추천 영상:
2:51
The Natural Log

Simplification Without a Calculator

Simplifying expressions like e^(ln 125) without a calculator relies on recognizing inverse functions and applying algebraic properties rather than numerical approximation, enabling exact answers in symbolic form.
추천 영상:
5:36
Change of Base Property