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Ch. 2 - Functions and Graphs
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Not the one you use?Change textbook
All textbooksBlitzer 8th EditionCh. 2 - Functions and GraphsProblem 97
Chapter 3, Problem 97

Begin by graphing the standard cubic function, f(x) = x3. Then use transformations of this graph to graph the given function. g(x) = (x − 3)3

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Start by recalling the standard cubic function f(x) = x³. This function has a characteristic S-shaped curve, passing through the origin (0, 0), with symmetry about the origin. The graph increases to the right and decreases to the left.
Understand the transformation applied to f(x) = x³ to obtain g(x) = (x − 3)³. The term (x − 3) indicates a horizontal shift. Specifically, the graph of f(x) = x³ is shifted 3 units to the right.
To graph g(x) = (x − 3)³, take each key point on the graph of f(x) = x³ (e.g., (-1, -1), (0, 0), (1, 1), etc.) and shift it 3 units to the right. For example, the point (0, 0) on f(x) becomes (3, 0) on g(x).
Sketch the new graph by connecting the shifted points smoothly, maintaining the same S-shaped curve as the original cubic function. Ensure the graph still increases to the right and decreases to the left, with the inflection point now at (3, 0).
Label the graph of g(x) = (x − 3)³ clearly, and verify that the transformation has been applied correctly by checking a few additional points. For example, if x = 4, g(4) = (4 − 3)³ = 1³ = 1, so the point (4, 1) should be on the graph.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cubic Functions

A cubic function is a polynomial function of degree three, typically expressed in the form f(x) = ax³ + bx² + cx + d. The graph of a cubic function can exhibit various shapes, including inflection points and changes in direction. Understanding the basic shape of the standard cubic function, f(x) = x³, is essential for recognizing how transformations affect its graph.
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Function Composition

Graph Transformations

Graph transformations involve shifting, reflecting, stretching, or compressing the graph of a function. For example, the transformation g(x) = (x - 3)³ represents a horizontal shift of the standard cubic function f(x) = x³ to the right by 3 units. Mastery of these transformations allows students to manipulate and graph functions based on their parent functions.
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Intro to Transformations

Horizontal Shifts

A horizontal shift occurs when the graph of a function is moved left or right along the x-axis. In the function g(x) = (x - 3)³, the '-3' indicates a shift to the right by 3 units. Understanding horizontal shifts is crucial for accurately graphing transformed functions and predicting their behavior based on the original function.
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Shifts of Functions
Related Practice
Textbook Question

Begin by graphing the standard cubic function, f(x) = x³. Then use transformations of this graph to graph the given function. h(x) = -x³

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Textbook Question

In Exercises 95–96, let f and g be defined by the following table: Find |ƒ(1) − f(0)| − [g (1)]² +g(1) ÷ ƒ(−1) · g (2) .

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Which graphs in Exercises 96–99 represent functions that have inverse functions?

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Solve by completing the square: 2x² – 5x + 1 = 0.

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Textbook Question

Begin by graphing the standard cubic function, f(x) = x³. Then use transformations of this graph to graph the given function. g(x) = x³-3

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