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Question 11 A rectangular garden bed has an area of 40 square feet. The length of the garden bed is 6 feet more than the width. What are the dimensions of the garden bed? Important: Be sure to submit in order from least to greatest! Length \( =\underline{\text { Blank } 1} \) Width \( =\underline{\text { Blank } \mathbf{2}} \)

Ask by Fernandez Powers. in the United States
Mar 10,2025

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Width \( = 4 \) feet Length \( = 10 \) feet

Solución

Let the width be \(x\) feet. Then the length is \(x+6\) feet. Since the area is 40 square feet, we set up the equation \[ x(x+6)=40. \] Expanding this, we have \[ x^2+6x-40=0. \] This is a quadratic equation. We solve it using the quadratic formula \[ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}, \] with \(a=1\), \(b=6\), and \(c=-40\). First compute the discriminant: \[ \Delta=6^2-4(1)(-40)=36+160=196. \] Since \(\sqrt{196}=14\), the solutions are \[ x=\frac{-6\pm14}{2}. \] We find \[ x=\frac{-6+14}{2}=\frac{8}{2}=4 \quad\text{or}\quad x=\frac{-6-14}{2}=-10. \] Since a negative width is not possible, \(x=4\) feet is the width. Then the length is \[ 4+6=10 \text{ feet}. \] Arranging the dimensions from least to greatest gives: Width \( = 4\) Length \( = 10\).

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Bonus Knowledge

To solve for the dimensions of the garden bed, let's denote the width as \( w \) feet. Since the length is 6 feet more than the width, we can express the length as \( w + 6 \) feet. The area of the rectangle can be represented by the equation: \[ w \times (w + 6) = 40 \] Expanding this gives: \[ w^2 + 6w - 40 = 0 \] Using the quadratic formula, \( w = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), where \( a = 1 \), \( b = 6 \), and \( c = -40 \): 1. Calculate the discriminant: \[ b^2 - 4ac = 6^2 - 4 \cdot 1 \cdot (-40) = 36 + 160 = 196 \] 2. Find the width: \[ w = \frac{-6 \pm \sqrt{196}}{2 \cdot 1} = \frac{-6 \pm 14}{2} \] This results in two possible widths: \[ w = \frac{8}{2} = 4 \quad \text{(width)} \quad \text{and} \quad w = \frac{-20}{2} = -10 \quad \text{(not valid)} \] 3. The width is 4 feet, and substituting back to find the length gives: \[ l = w + 6 = 4 + 6 = 10 \text{ feet} \] Finally, the dimensions of the garden bed are: Length \( = \underline{10} \) Width \( = \underline{4} \)

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