Problem 19 For each piecewise-defined funct... [FREE SOLUTION] (2024)

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Chapter 2: Problem 19

For each piecewise-defined function, find (a) \(f(-5),\) (b) \(f(-1),\) (c)\(f(0),\) and ( \(d\) ) \(f(3)\) See Example 2. $$f(x)=\left\\{\begin{array}{ll} 2+x & \text { if } x < -4 \\ -x & \text { if }-4 \leq x \leq 2 \\ 3 x & \text { if } x > 2 \end{array}\right.$$

Short Answer

Expert verified

f(-5) = -3, f(-1) = 1, f(0) = 0, f(3) = 9

Step by step solution


- Evaluate f(-5)

Check which piece of the piecewise function applies to when \(x = -5\). Since \( -5 < -4 \), use the function \(2 + x\). Substitute \(x = -5\) into the equation: \[ f(-5) = 2 + (-5) = 2 - 5 = -3 \]


- Evaluate f(-1)

Check which piece of the piecewise function applies to when \(x = -1\). Since \(-4 \leq -1 \leq 2\), use the function \(-x\). Substitute \(x = -1\) into the equation: \[ f(-1) = -(-1) = 1 \]


- Evaluate f(0)

Check which piece of the piecewise function applies to when \(x = 0\). Since \(-4 \leq 0 \leq 2\), use the function \(-x\). Substitute \(x = 0\) into the equation: \[ f(0) = -0 = 0 \]


- Evaluate f(3)

Check which piece of the piecewise function applies to when \(x = 3\). Since \(3 > 2\), use the function \(3x\). Substitute \(x = 3\) into the equation: \[ f(3) = 3(3) = 9 \]

Key Concepts

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

Evaluating Functions

Evaluating functions means finding the value of a function for a specific input value. When you evaluate a function, you substitute the given input value (usually represented as x) into the function's formula. This process is done step-by-step to ensure accuracy. For example, if you have a function defined as \(f(x) = x^2\), and you need to find \(f(3)\), you replace x with 3 and compute \(3^2 = 9\). Always pay attention to the function's formula and carefully substitute the input value. Completing these steps accurately is crucial to understanding the behavior of the function.

Piecewise-Defined Function

A piecewise-defined function is a function that is not defined by a single equation but by multiple equations, each applying to a specific interval of the input values. These functions are often used to model situations where a rule or relationship changes depending on the input. For example:
\ \(f(x)=\begin{cases} 2+x & \text{if } x < -4 \ -x & \text{if }-4 \leq x \leq 2 \ 3x & \text{if } x > 2 \end{cases}\)
When working with piecewise functions, it is essential to note which interval each piece of the function corresponds to. Evaluating the function at any given point depends on identifying and using the correct equation from the provided pieces.


Precalculus is a course that prepares students for calculus by covering various mathematical concepts that are foundational for more advanced studies. It includes the study of functions, including piecewise-defined functions, trigonometry, sequences, and limits. The skills you learn in precalculus, such as function evaluation and understanding different types of functions, are essential as they provide the groundwork for calculus topics such as differentiation and integration. Mastering these areas through practice and problem-solving helps build the confidence needed to tackle more complex mathematical challenges.

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Problem 19 For each piecewise-defined funct... [FREE SOLUTION] (3)

Most popular questions from this chapter

Solve each problem. cost of Private College Education The table lists the average annual cost (indollars) of tuition and fees at private four-year colleges for selected years. (a) Determine a linear function \(f(x)=m x+b\) that models the data, where \(x=0\)represents 1996 \(x=1\) represents \(1997,\) and so on. Use the points \((0,12,881)\) and \((12,22,449)\) to graph \(f\) and a scatter diagram of the dataon the same coordinate axes. (You may wish to use a graphing calculator.) Whatdoes the slope of the graph of \(f\) indicate? (b) Use this function to approximate tuition and fees in \(2007 .\) Compare yourapproximation to the actual value of \(\$ 21,979\). (c) Use the linear regression feature of a graphing calculator to find theequation of the line of best fit.Use a graphing calculator to solve each linear equation. $$3(2 x+1)-2(x-2)=5$$Let \(f(x)=x^{2}+3\) and \(g(x)=-2 x+6 .\) Find each of the following. $$(f-g)(-1)$$Solve each problem. To visualize the situation, use graph paper and a pair ofcompasses to carefully draw the graphs of the circles. The locations of three receiving stations and the distances to the epicenterof an earthquake are contained in the following three equations:\((x-2)^{2}+(y-4)^{2}=25\) \((x-1)^{2}+(y+3)^{2}=25,\) and\((x+3)^{2}+(y+6)^{2}=100 .\) Determine the location of the epicenter.
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Problem 19 For each piecewise-defined funct... [FREE SOLUTION] (2024)
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