3x if x<2 f(x)= ; x=2 x² +k_if x> 2

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Find a value for k so that the given function will be continuous at the indicated value for x

## Piecewise Function Example

### Problem 61:
Consider the piecewise function defined by:

\[ 
f(x) = 
\begin{cases} 
3x & \text{if } x \leq 2 \\
x^2 + k & \text{if } x > 2 
\end{cases}
\]

Here, \( f(x) \) takes different functional forms depending on the value of \( x \):

- For \( x \) less than or equal to 2, \( f(x) = 3x \).
- For \( x \) greater than 2, \( f(x) = x^2 + k \).

It is specified that the function reaches a value at \( x = 2 \): 

\[ f(x=2) \]

To solve for \( f(x=2) \) using the defined piecewise conditions, we use the first case since \( x = 2 \) (which is less than or equal to 2):

Thus,

\[ f(2) = 3 \cdot 2 = 6 \]

Understanding the conditions and the continuous nature of the function at transition points is key when working with piecewise functions.
Transcribed Image Text:## Piecewise Function Example ### Problem 61: Consider the piecewise function defined by: \[ f(x) = \begin{cases} 3x & \text{if } x \leq 2 \\ x^2 + k & \text{if } x > 2 \end{cases} \] Here, \( f(x) \) takes different functional forms depending on the value of \( x \): - For \( x \) less than or equal to 2, \( f(x) = 3x \). - For \( x \) greater than 2, \( f(x) = x^2 + k \). It is specified that the function reaches a value at \( x = 2 \): \[ f(x=2) \] To solve for \( f(x=2) \) using the defined piecewise conditions, we use the first case since \( x = 2 \) (which is less than or equal to 2): Thus, \[ f(2) = 3 \cdot 2 = 6 \] Understanding the conditions and the continuous nature of the function at transition points is key when working with piecewise functions.
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