Math Problem Statement

The area of a rectangle is 1,056 square inches. Its length is 4 inches longer than 2 times its width. Which equation can you use to find the width of the rectangle, w? What is the width of the rectangle?

Solution

To solve this problem, let's go through the information provided step-by-step.

Given Information:

  • The area of a rectangle is 1,0561,056 square inches.
  • The length of the rectangle is 44 inches more than 22 times its width ww.

Formulating the Equation:

  1. Define the Length in Terms of Width: Since the length LL is 44 inches longer than 22 times the width ww, we can write: L=2w+4L = 2w + 4

  2. Area Formula: The area AA of a rectangle is given by the formula: A=length×widthA = \text{length} \times \text{width} Substituting the values we have: 1,056=(2w+4)×w1,056 = (2w + 4) \times w

  3. Answer Choice: Among the options provided, the correct equation to use is: 1,056=(2w+4)×w1,056 = (2w + 4) \times w This matches the first option: 1,056=(4+2w)w1,056 = (4 + 2w)w.

Solving for ww (Width of the Rectangle):

  1. Expand the equation: 1,056=2w2+4w1,056 = 2w^2 + 4w

  2. Rearrange the equation into standard quadratic form: 2w2+4w1,056=02w^2 + 4w - 1,056 = 0

  3. Divide by 2 to simplify: w2+2w528=0w^2 + 2w - 528 = 0

  4. Solve this quadratic equation using the quadratic formula: w=b±b24ac2aw = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} Here, a=1a = 1, b=2b = 2, and c=528c = -528.

  5. Calculate: w=2±(2)241(528)21w = \frac{-2 \pm \sqrt{(2)^2 - 4 \cdot 1 \cdot (-528)}}{2 \cdot 1} w=2±4+21122w = \frac{-2 \pm \sqrt{4 + 2112}}{2} w=2±21162w = \frac{-2 \pm \sqrt{2116}}{2} w=2±462w = \frac{-2 \pm 46}{2}

  6. This gives two solutions: w=442=22orw=482=24w = \frac{44}{2} = 22 \quad \text{or} \quad w = \frac{-48}{2} = -24 Since width cannot be negative, w=22w = 22 inches.

Final Answer:

The width of the rectangle is 22 inches.

Would you like further details, or do you have any questions?

Here are some related questions you may find helpful:

  1. How do you use the quadratic formula to solve other area-related problems?
  2. What are other ways to solve quadratic equations besides the quadratic formula?
  3. How does changing the dimensions of a rectangle affect its area?
  4. What happens if you increase both the length and width by the same factor?
  5. How can we apply these concepts to solve real-world problems?

Tip: When faced with quadratic equations, always look for simplifications first, like dividing the entire equation by common factors. This makes calculations easier.

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Math Problem Analysis

Mathematical Concepts

Geometry
Algebra
Quadratic Equations

Formulas

Area of a rectangle: A = length × width
Quadratic equation: ax^2 + bx + c = 0

Theorems

Quadratic Formula

Suitable Grade Level

Grades 7-9