SOLUTION: The width of a rectangular pool is 12 feet less than its length. The area of the pool is 800 ft.². To the nearest 10th, what is the width of the pool?

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Question 1156274: The width of a rectangular pool is 12 feet less than its length. The area of the pool is 800 ft.². To the nearest 10th, what is the width of the pool?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
w for width, the w=L-12, and L=w+12.

w%28w%2B12%29=800
w%5E2%2B12w-800=0
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Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

Standard problem


    W*(W+12) = 800


    W^2 + 12W - 800 = 0.


Solve this quadratic equation using the quadratic formula.

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On quadratic formula, see the lessons
    - Introduction into Quadratic Equations
    - PROOF of quadratic formula by completing the square
in this site.