Math Problem Statement

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A rectangular flower bed has a length of 10 meters and a width of 8 meters. There is a walking path of unknown width surrounding the bed, and the total area (including the path) is 48 square meters. Find the width of the path.

Solution

Let's go through the steps to solve the problem shown in the first image. The problem seems to be based on a rectangular flower bed and some unknown values that need to be found.


Image 1: Step-by-step breakdown:

Step 1: Translate the situation into a quadratic equation.

  • We are given a rectangular flower bed with the following dimensions:

    • Width of the flower bed: 8 meters
    • Length of the flower bed: 10 meters

    There is a walking path (道) around the flower bed that is of a uniform width, and the total area of the flower bed plus the path is 48 square meters.

Let the unknown width of the path be represented by x meters.

  • The total dimensions of the flower bed plus the path will then be:
    • Length: 10+2x10 + 2x meters (since there is a path on both sides, the total length increases by 2x2x).
    • Width: 8+2x8 + 2x meters (similarly, the width increases by 2x2x).

The total area, including the path, is given as 48 square meters.


Step 2: Form a quadratic equation.

The area of the flower bed plus the path is the product of the length and width, and we know it equals 48 square meters:

(10+2x)(8+2x)=48(10 + 2x)(8 + 2x) = 48

Now, expand the equation:

(10+2x)(8+2x)=80+20x+16x+4x2=80+36x+4x2(10 + 2x)(8 + 2x) = 80 + 20x + 16x + 4x^2 = 80 + 36x + 4x^2

Set the equation equal to 48:

80+36x+4x2=4880 + 36x + 4x^2 = 48

Subtract 48 from both sides:

4x2+36x+32=04x^2 + 36x + 32 = 0


Step 3: Solve the quadratic equation.

We now have a quadratic equation:

4x2+36x+32=04x^2 + 36x + 32 = 0

First, divide through by 4 to simplify:

x2+9x+8=0x^2 + 9x + 8 = 0

Now, solve using the quadratic formula:

x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

For this equation, (a

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Area Calculation

Formulas

Area of a rectangle = length × width
Quadratic equation: ax^2 + bx + c = 0
Quadratic formula: x = (-b ± √(b^2 - 4ac)) / 2a

Theorems

Quadratic formula

Suitable Grade Level

Grades 8-10