Sketch the graph of the function f and evaluate lim f(x). (x+5, if x s-3 f(x) = %3D -2x-1, ifx >-3

Intermediate Algebra
10th Edition
ISBN:9781285195728
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter9: Functions
Section9.1: Relations And Functions
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**Title: Understanding Piecewise Functions and Limits**

---

**Introduction**

In this section, we will explore the concept of piecewise functions and their graphical representation. We will also look into how to evaluate the limit of such functions as they approach a specific point.

---

**Piecewise Function Example**

Consider the following piecewise function:

\[
f(x) = 
\begin{cases} 
x + 5, & \text{if } x \leq 3 \\ 
-2x - 1, & \text{if } x > 3 
\end{cases}
\]

**Task**

We are tasked with sketching the graph of this function and evaluating the limit of \( f(x) \) as \( x \) approaches 3.

---

**Graphical Representation**

- **Part 1**: For \( x \leq 3 \), the function is \( f(x) = x + 5 \).
  - This is a straight line with a slope of 1 and a y-intercept at 5.
  - The line continues until \( x = 3 \), where it is represented as a solid dot indicating that the point is included in this segment.

- **Part 2**: For \( x > 3 \), the function becomes \( f(x) = -2x - 1 \).
  - This is a line with a slope of -2 and a y-intercept at -1.
  - The graph begins at \( x = 3 \), shown as an open circle to indicate that this point is not included.

**Graph Detail Explanation**

- The graph shows two distinct linear parts for the function.
- As \( x \) increases up to 3, the line follows the equation \( y = x + 5 \), reaching a value of 8 at \( x = 3 \).
- Beyond \( x = 3 \), the line shifts to follow \( y = -2x - 1 \), beginning at the open circle above \( x = 3 \).

---

**Evaluating the Limit**

To find \(\lim_{x \to 3} f(x)\), we need to consider the behavior of the function as \( x \) approaches 3 from both sides:

- As \( x \) approaches 3 from the left (\( x \leq 3 \)), \( f(x) = x + 5 \) approaches
Transcribed Image Text:**Title: Understanding Piecewise Functions and Limits** --- **Introduction** In this section, we will explore the concept of piecewise functions and their graphical representation. We will also look into how to evaluate the limit of such functions as they approach a specific point. --- **Piecewise Function Example** Consider the following piecewise function: \[ f(x) = \begin{cases} x + 5, & \text{if } x \leq 3 \\ -2x - 1, & \text{if } x > 3 \end{cases} \] **Task** We are tasked with sketching the graph of this function and evaluating the limit of \( f(x) \) as \( x \) approaches 3. --- **Graphical Representation** - **Part 1**: For \( x \leq 3 \), the function is \( f(x) = x + 5 \). - This is a straight line with a slope of 1 and a y-intercept at 5. - The line continues until \( x = 3 \), where it is represented as a solid dot indicating that the point is included in this segment. - **Part 2**: For \( x > 3 \), the function becomes \( f(x) = -2x - 1 \). - This is a line with a slope of -2 and a y-intercept at -1. - The graph begins at \( x = 3 \), shown as an open circle to indicate that this point is not included. **Graph Detail Explanation** - The graph shows two distinct linear parts for the function. - As \( x \) increases up to 3, the line follows the equation \( y = x + 5 \), reaching a value of 8 at \( x = 3 \). - Beyond \( x = 3 \), the line shifts to follow \( y = -2x - 1 \), beginning at the open circle above \( x = 3 \). --- **Evaluating the Limit** To find \(\lim_{x \to 3} f(x)\), we need to consider the behavior of the function as \( x \) approaches 3 from both sides: - As \( x \) approaches 3 from the left (\( x \leq 3 \)), \( f(x) = x + 5 \) approaches
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