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\(\mathrm{G}\) is related to one of the parent functions described in Section 1.6. (a) Identify the parent function \(f\). (b) Describe the sequence of transformations from \(f\) to \(g\). (c) Sketch the graph of \(g\). (d) Use function notation to write \(g\) in terms of \(f\). $$ g(x)=-x^{3}-1 $$

Short Answer

Expert verified
The parent function is \(f(x) = x^3\). The transformations from \(f(x)\) to \(g(x) = -x^{3}-1\) are a reflection over the x-axis and a downward shift of one unit. Therefore, \(g(x)\) can be written as \(g(x) = -f(x) - 1\).

Step by step solution

01

Identify the parent function

The parent function for the function given \(g(x)\) is the cubed function \(f(x) = x^3\). This is determined by the \(x^3\) in the equation \(g(x) = -x^{3}-1\). Therefore, \(f(x) = x^3\) is the parent function.
02

Describe the sequence of transformations from f to g

The function \(g(x)\) is a transformation of the parent function \(f(x)\). The cube function has been reflected over the x-axis, and then translated one unit down. This translation is due to the negative sign and the one unit subtracted from the function.
03

Sketch the graph of g

To sketch the graph of \(g\), first draw the graph of the parent function \(f(x)\) which is \(f(x) = x^3\). The graph of \(f(x) = x^3\) is a curve that increases for positive \(x\) and decreases for negative \(x\). Now reflect this graph over the x-axis, the new shape represents the negative transformation. Then, shift the whole graph downwards by one unit which is represented by the \(-1\) in the function \(g(x)\). This represents the function \(g(x) = -x^3 - 1\).
04

Write g in terms of f

To express \(g(x)\) in terms of the parent function \(f(x)\), remember that \(f(x) = x^3\). The transformations to \(f(x)\) are reflection over the x-axis and the one unit downward shift. So, \(g(x) = -f(x) - 1\), which reads 'g of x equals negative f of x minus 1'

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Function Transformations
Function transformations involve changing the appearance or position of a graph on the coordinate plane. This can be achieved through operations such as shifting, stretching, compressing, and reflecting the graph of a parent function. Understanding function transformations helps in analyzing how different functions relate to their basic parent form. In the context of the exercise, the function transformations applied to the parent function \(f(x) = x^3\) include a reflection across the x-axis and a vertical translation (shift) downward by one unit. Transformations can be classified into two types:
  • Rigid Transformations: These include translations and reflections, which change the position but not the shape of the graph.
  • Non-rigid Transformations: These affect the shape of the graph, such as stretches and compressions.
In the given problem, reflecting the function is a rigid transformation while shifting the graph downward is also a rigid transformation.
Graph Sketching
Graph sketching is the process of drawing the function's curve to visualize its behavior and transformations. It's an essential skill for understanding how functions behave under transformations and for seeing the effects of those transformations. To sketch \(g(x) = -x^3 - 1\), start with the parent function \(f(x) = x^3\), which features:
  • A curve that rises quickly for positive values of \(x\)
  • A curve that dips rapidly for negative values of \(x\)
First, reflect the graph of \(f(x) = x^3\) across the x-axis. This mirror-like transformation turns all positive values negative and vice versa. The resulting graph reflects the transformation from \(x^3\) to \(-x^3\). Finally, translate or shift the entire graph down by one unit, corresponding to the \(-1\) in the equation \(g(x) = -x^3 - 1\). This process results in the complete graph of \(g(x)\), showing how the transformations alter the original parent function.
Function Notation
Function notation is a way to express mathematical functions efficiently, using symbols to reflect relationships between input and output variables. The notation \(f(x)\) shows that \(f\) is a function of \(x\). It's a concise way to convey information about how a function behaves or changes.In the context of the given exercise, the function \(g(x) = -f(x) - 1\) uses function notation to represent that \(g\) is derived from the parent function \(f(x) = x^3\). It tells us that to obtain \(g(x)\), we need to negate \(f(x)\) and then subtract 1 from the result. Using function notation helps in:
  • Clearly conveying the changes made to a function
  • Expressing complex transformations succinctly
  • Comparing and analyzing different functions easily
By mastering function notation, you'll be better prepared to manage and solve problems involving complex transformations.
Reflections and Translations
Reflections and translations are fundamental operations in function transformations, altering the graph's position and orientation without changing its overall shape. These operations help in constructing the graph of transformed functions quickly and precisely.A reflection across the x-axis, like the one in \(g(x) = -x^3 - 1\), flips the graph upside down. It transforms each point \((x, y)\) to \((x, -y)\). In essence, positive y-values become negative, and vice versa. This dramatically changes the graph's appearance and behavior.Translations are shifts of the entire graph. With \(g(x) = -x^3 - 1\), a translation occurs as the graph is moved down one unit. Each point \((x, y)\) shifts to \((x, y - 1)\). This process doesn't change the graph's shape, just its location on the coordinate plane.Combined, reflections and translations form a powerful toolkit for modifying functions. Mastering these concepts aids in understanding more complex function operations and transforms.

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Most popular questions from this chapter

The total sales (in billions of dollars) for CocaCola Enterprises from 2000 through 2007 are listed below. (Source: Coca-Cola Enterprises, Inc.) $$\begin{array}{llll} 2000 & 14.750 & 2004 & 18.185 \\ 2001 & 15.700 & 2005 & 18.706 \\ 2002 & 16.899 & 2006 & 19.804 \\ 2003 & 17.330 & 2007 & 20.936 \end{array}$$ (a) Sketch a scatter plot of the data. Let \(y\) represent the total revenue (in billions of dollars) and let \(t=0\) represent 2000 . (b) Use a straightedge to sketch the best-fitting line through the points and find an equation of the line. (c) Use the regression feature of a graphing utility to find the least squares regression line that fits the data. (d) Compare the linear model you found in part (b) with the linear model given by the graphing utility in part (c). (e) Use the models from parts (b) and (c) to estimate the sales of Coca-Cola Enterprises in 2008 . (f) Use your school's library, the Internet, or some other reference source to analyze the accuracy of the estimate in part (e).

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