Using a calculator, pencil and paper, apply the bisection method to find a root of y=f(x)=1-2x cosx by filling in a table of the form shown below. For the “sign" columns enter + or – sign f (a) sign f (x) b sign f (b) а 0.5 0.7 In each row x=(a+b)/2 . Once the table is complete, report your best estimate of the root in the form r±d.

Calculus: Early Transcendentals
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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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### Bisection Method to Find a Root of the Function \( y = f(x) = 1 - 2x \cos x \)

To apply the bisection method to find a root of the function \( y = f(x) = 1 - 2x \cos x \), follow these steps:

1. **Initial Interval Selection:**
   - Choose the initial interval \([a, b]\) where \(f(a)\) and \(f(b)\) have opposite signs.

2. **Table Filling Procedure:**
   - Complete the table below by calculating the midpoint \(x\) of the interval \([a, b]\) and the function value \(f(x)\).
   - Based on \(f(x)\), decide the next interval for the bisection method.

#### Table Format

| \(a\)  | sign \(f(a)\)  | \(x\)  | sign \(f(x)\)  | \(b\)  | sign \(f(b)\)  |
|-------|----------------|-------|----------------|-------|----------------|
| 0.5   |                |       |                | 0.7   |                |
|       |                |       |                |       |                |
|       |                |       |                |       |                |
|       |                |       |                |       |                |

3. **Procedure for Each Row:**
   - Calculate \( x = \frac{a+b}{2} \).
   - Evaluate \(f(x)\).
   - Enter the signs \(+\) or \(-\) for \(f(a)\), \(f(x)\), and \(f(b)\).
   - Update the interval \([a, b]\) based on the sign of \(f(x)\).

4. **Estimation of Root:**
   - Continue this procedure until the interval is sufficiently small.
   - Report the best estimate of the root in the form \( r \pm \delta \).

**Example Interval:**

- Initial interval: \(a = 0.5\), \(b = 0.7\).

By evaluating the function at these points and their midpoint, complete the table, and follow through the bisection steps to find the root.

**Note:** To ensure accuracy in your application of the bisection method, use a calculator to determine the value of \(f(x)\) accurately at each step.
Transcribed Image Text:--- ### Bisection Method to Find a Root of the Function \( y = f(x) = 1 - 2x \cos x \) To apply the bisection method to find a root of the function \( y = f(x) = 1 - 2x \cos x \), follow these steps: 1. **Initial Interval Selection:** - Choose the initial interval \([a, b]\) where \(f(a)\) and \(f(b)\) have opposite signs. 2. **Table Filling Procedure:** - Complete the table below by calculating the midpoint \(x\) of the interval \([a, b]\) and the function value \(f(x)\). - Based on \(f(x)\), decide the next interval for the bisection method. #### Table Format | \(a\) | sign \(f(a)\) | \(x\) | sign \(f(x)\) | \(b\) | sign \(f(b)\) | |-------|----------------|-------|----------------|-------|----------------| | 0.5 | | | | 0.7 | | | | | | | | | | | | | | | | | | | | | | | 3. **Procedure for Each Row:** - Calculate \( x = \frac{a+b}{2} \). - Evaluate \(f(x)\). - Enter the signs \(+\) or \(-\) for \(f(a)\), \(f(x)\), and \(f(b)\). - Update the interval \([a, b]\) based on the sign of \(f(x)\). 4. **Estimation of Root:** - Continue this procedure until the interval is sufficiently small. - Report the best estimate of the root in the form \( r \pm \delta \). **Example Interval:** - Initial interval: \(a = 0.5\), \(b = 0.7\). By evaluating the function at these points and their midpoint, complete the table, and follow through the bisection steps to find the root. **Note:** To ensure accuracy in your application of the bisection method, use a calculator to determine the value of \(f(x)\) accurately at each step.
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