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Ch. 1 - Functions
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Capitolo 1, Problema 30

Graphing functions Sketch a graph of each function.


ƒ(x) = { 2x if x ≤ 1 , 3-x if x > 1

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1
Identify the type of function: This is a piecewise function, which means it is defined by different expressions depending on the value of x.
Determine the domain for each piece: The function is defined as f(x) = 2x for x ≤ 1 and f(x) = 3 - x for x > 1.
Sketch the first piece: For f(x) = 2x when x ≤ 1, this is a linear function with a slope of 2. Plot the line starting from x = -∞ to x = 1, including the point (1, 2) as a solid dot since x = 1 is included.
Sketch the second piece: For f(x) = 3 - x when x > 1, this is also a linear function with a slope of -1. Plot the line starting just after x = 1, with an open circle at (1, 2) since x = 1 is not included in this piece, and continue to x = ∞.
Combine the pieces: Ensure the graph is continuous at x = 1 by checking the values of both pieces at this point. The first piece ends at (1, 2) and the second piece starts just after (1, 2), so the graph is not continuous at x = 1.

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Piecewise Functions

A piecewise function is defined by different expressions based on the input value. In this case, the function ƒ(x) has two distinct rules: 2x for x values less than or equal to 1, and 3-x for x values greater than 1. Understanding how to evaluate and graph each piece separately is crucial for accurately representing the overall function.
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Percorso guidato
05:36
Piecewise Functions

Graphing Techniques

Graphing techniques involve plotting points and understanding the behavior of functions across their domains. For piecewise functions, it is important to identify the points where the function changes its rule, and to ensure continuity or discontinuity at those points. This includes determining the endpoints and whether they are included in the graph.
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Percorso guidato
06:15
Graphing The Derivative

Continuity and Discontinuity

Continuity refers to a function being unbroken at a point, meaning the function's value at that point matches the limit as it approaches from either side. In the case of the given piecewise function, checking continuity at x = 1 is essential, as it determines whether the graph has a jump or is smooth at that transition point.
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Intro to Continuity
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