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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
Tutti i libri di testoBlitzer 8th EditionCh. 4 - Exponential and Logarithmic FunctionsProblema 92
Capitolo 5, Problema 92

Graph f(x) = 2x and its inverse function in the same rectangular coordinate system.

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Identify the given function: \(f(x) = 2^x\). This is an exponential function where the base is 2.
Recall that the inverse function of \(f(x) = 2^x\) is the logarithmic function with base 2, written as \(f^{-1}(x) = \log_2(x)\).
To graph \(f(x) = 2^x\), plot key points such as \((0, 1)\) because \(2^0 = 1\), \((1, 2)\) because \(2^1 = 2\), and \((-1, \frac{1}{2})\) because \(2^{-1} = \frac{1}{2}\). Connect these points with a smooth curve increasing from left to right.
To graph the inverse \(f^{-1}(x) = \log_2(x)\), plot points by swapping the coordinates of the points from \(f(x)\). For example, from \((0,1)\) on \(f(x)\), plot \((1,0)\) on \(f^{-1}(x)\); from \((1,2)\) on \(f(x)\), plot \((2,1)\) on \(f^{-1}(x)\); and from \((-1, \frac{1}{2})\) on \(f(x)\), plot \((\frac{1}{2}, -1)\) on \(f^{-1}(x)\). Connect these points with a smooth curve increasing from left to right.
Draw the line \(y = x\) as a reference line. The graphs of \(f(x)\) and \(f^{-1}(x)\) are symmetric with respect to this line, which helps verify the accuracy of your graphs.

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Exponential Functions

An exponential function has the form f(x) = a^x, where a is a positive constant not equal to 1. It models rapid growth or decay and has a domain of all real numbers and a range of positive real numbers. For f(x) = 2^x, the graph passes through (0,1) and increases exponentially as x increases.
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Exponential Functions

Inverse Functions

An inverse function reverses the effect of the original function, swapping inputs and outputs. For f(x) = 2^x, its inverse is the logarithmic function f⁻¹(x) = log₂(x). Graphically, the inverse reflects the original function across the line y = x, exchanging the roles of x and y.
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Graphing Logarithmic Functions

Graphing on Rectangular Coordinate System

Graphing functions on the rectangular coordinate system involves plotting points (x, y) to visualize their behavior. When graphing a function and its inverse together, the line y = x serves as a mirror, helping to verify the correctness of the inverse by symmetry. Understanding scale and intercepts aids in accurate plotting.
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Graphs & the Rectangular Coordinate System
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