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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 67

The figure shows the graph of f(x) = ln x. In Exercises 65–74, use transformations of this graph to graph each function. Graph and give equations of the asymptotes. Use the graphs to determine each function's domain and range.
Graph of the natural logarithm function f(x) = ln x with points and vertical asymptote at x = 0.
h(x) = ln (2x)

검증된 단계별 안내
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Start with the base function \(f(x) = \ln x\), which has a vertical asymptote at \(x = 0\), domain \((0, \infty)\), and range \((-\infty, \infty)\).
The function \(h(x) = \ln(2x)\) represents a horizontal scaling of the base function by a factor of \(\frac{1}{2}\) inside the argument of the logarithm.
To find the new vertical asymptote, set the inside of the logarithm equal to zero: \(2x = 0\), which gives \(x = 0\). So the vertical asymptote remains at \(x = 0\).
Determine the domain of \(h(x)\) by solving \(2x > 0\), which simplifies to \(x > 0\). Thus, the domain is \((0, \infty)\), same as the original function.
The range of \(h(x)\) remains \((-\infty, \infty)\) because logarithmic functions are continuous and unbounded vertically regardless of horizontal scaling.

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Logarithmic Functions and Their Graphs

A logarithmic function, such as f(x) = ln(x), is the inverse of an exponential function. Its graph passes through (1,0) and has a vertical asymptote at x = 0. The function is defined only for positive x-values, giving it a domain of (0, ∞) and a range of all real numbers.
추천 영상:
5:26
Graphs of Logarithmic Functions

Transformations of Functions

Transformations involve shifting, stretching, compressing, or reflecting a graph. For h(x) = ln(2x), the factor 2 inside the logarithm compresses the graph horizontally by a factor of 1/2. This changes the domain and shifts the vertical asymptote accordingly, affecting the graph's shape and position.
추천 영상:
4:22
Domain & Range of Transformed Functions

Asymptotes and Domain of Logarithmic Functions

The vertical asymptote of a logarithmic function occurs where the argument of the log equals zero. For h(x) = ln(2x), the asymptote is at x = 0 since 2x = 0 when x = 0. The domain is all x-values making the argument positive, so here the domain is (0, ∞). Understanding asymptotes helps define where the function is valid.
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6:24
Introduction to Asymptotes
관련 실천
교과서 질문

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교과서 질문

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교과서 질문

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교과서 질문

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교과서 질문

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