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A rectangular garden whose width is 4 meters less than its length has an area of 57 square meters. Find the dimensions of the garden to the nearest tenth of a meter.

A rectangular garden whose width is 44 meters less than its length has an area of 5757 square meters. Find the dimensions of the garden to the nearest tenth of a meter.

Full solution

Q. A rectangular garden whose width is 44 meters less than its length has an area of 5757 square meters. Find the dimensions of the garden to the nearest tenth of a meter.
  1. Define Variables: Let's call the length of the garden LL meters and the width WW meters. We know that W=L4W = L - 4. The area of the garden is given as 5757 square meters, so we can write the equation L×W=57L \times W = 57.
  2. Area Equation: Now we substitute WW with L4L - 4 in the area equation: L×(L4)=57L \times (L - 4) = 57.
  3. Expand Equation: Expanding the equation gives us L24L=57L^2 - 4L = 57.
  4. Quadratic Equation: To find the value of LL, we need to solve the quadratic equation. We move all terms to one side to set the equation to zero: L24L57=0L^2 - 4L - 57 = 0.
  5. Quadratic Formula: We can solve the quadratic equation by factoring, completing the square, or using the quadratic formula. The quadratic formula is L=b±b24ac2aL = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}. In our equation, a=1a = 1, b=4b = -4, and c=57c = -57.
  6. Substitute Values: Plugging the values into the quadratic formula gives us L=4±(4)241(57)21.L = \frac{4 \pm \sqrt{(-4)^2 - 4\cdot1\cdot(-57)}}{2\cdot1}.
  7. Simplify Square Root: Simplifying inside the square root: L=4±16+2282L = \frac{4 \pm \sqrt{16 + 228}}{2}.
  8. Calculate Solutions: Further simplification gives us L=4±2442L = \frac{4 \pm \sqrt{244}}{2}.
  9. Discard Negative Solution: Calculating the square root of 244244 gives us approximately 15.6215.62. So, L=(4±15.62)/2L = (4 \pm 15.62) / 2.
  10. Calculate Length: We have two possible solutions for LL: L=(4+15.62)/2L = (4 + 15.62) / 2 or L=(415.62)/2L = (4 - 15.62) / 2. Since a length can't be negative, we discard the second solution.
  11. Calculate Width: Calculating the positive solution gives us L=(4+15.62)/2=19.62/2=9.81L = (4 + 15.62) / 2 = 19.62 / 2 = 9.81 meters.
  12. Calculate Width: Calculating the positive solution gives us L=(4+15.62)/2=19.62/2=9.81L = (4 + 15.62) / 2 = 19.62 / 2 = 9.81 meters. Now we find the width using the relationship W=L4W = L - 4: W=9.814=5.81W = 9.81 - 4 = 5.81 meters.

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