Consider the following problem: A farmer with 950 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens? (a) Draw several diagrams illustrating the situation, some with shallow, wide pens and some with deep, narrow pens. Find the total areas of these configurations. Does it appear that there is a maximum area? If so, estimate it. (b) Draw a diagram illustrating the general situation. Let x denote the length of each of two sides and three dividers. Let y denote the length of the other two sides. (c) Write an expression for the total area A in terms of both x and y. A = x•y (d) Use the given information to write an equation that relates the variables. y= 475 e

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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**Problem Statement:**

A farmer with 950 ft of fencing wants to enclose a rectangular area and divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens?

**Tasks and Solutions:**

(a) **Drawing Diagrams:**

- Draw different configurations of the rectangle with shallow, wide pens, and deep, narrow pens.
- Determine if there appears to be a configuration with a maximum area.

(b) **Diagram of General Situation:**

- Let \( x \) denote the length of each of two sides and three dividers.
- Let \( y \) denote the length of the other two sides.

(c) **Expression for Total Area:**

- **Formula:** \( A = x \cdot y \)

(d) **Relating Variables:**

- Derive an equation using the given information:
  - **Incorrect Formula:** \( y = 475 - \frac{5}{e}x \)

(e) **Total Area as a Function of One Variable:**

- Use the correct relation from part (d):
  - **Formula:** \( A(x) = 475x - \frac{5}{2}x^2 \)

(f) **Finding the Largest Area:**

- Solve for the maximum area.
  - **Result:** \( 22562.5 \, \text{ft}^2 \)

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Transcribed Image Text:**Problem Statement:** A farmer with 950 ft of fencing wants to enclose a rectangular area and divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens? **Tasks and Solutions:** (a) **Drawing Diagrams:** - Draw different configurations of the rectangle with shallow, wide pens, and deep, narrow pens. - Determine if there appears to be a configuration with a maximum area. (b) **Diagram of General Situation:** - Let \( x \) denote the length of each of two sides and three dividers. - Let \( y \) denote the length of the other two sides. (c) **Expression for Total Area:** - **Formula:** \( A = x \cdot y \) (d) **Relating Variables:** - Derive an equation using the given information: - **Incorrect Formula:** \( y = 475 - \frac{5}{e}x \) (e) **Total Area as a Function of One Variable:** - Use the correct relation from part (d): - **Formula:** \( A(x) = 475x - \frac{5}{2}x^2 \) (f) **Finding the Largest Area:** - Solve for the maximum area. - **Result:** \( 22562.5 \, \text{ft}^2 \) Need help with this problem? Use the resources: - **Read It** - **Watch It**
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