Question 283642
L = length
W = width
A = area
A = L*W
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L = 2W + 3 
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A = 93 cm^2
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Substitute L = 2W+3 in the area equation to solve.
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L*W = 93 cm^2
(2W +3) * W = 93
2W^2 + 3W = 93
2W^2 + 3W -93 = 0
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This does not factor nicely, so you need to use the quadratic equation.
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*[invoke quadratic "W", 2, 3, -93 ]
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This provides two solutions:  W=6.11 and W=-7.61.
W cannot be negative, so the approximate value is W=6.11.
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Substituting, W=6.11, we can find L.
L = 93/6.11
L = 15.22 cm
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Checking, does the area = 93 cm^2?
(15.22)(6.11) = 92.9942 cm^2, which is close enough to 93.
Correct.
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Checking, does L = 2W + 3?
2W = 2*6.11 = 12.22 cm
12.22 + 3 = 15.22 cm
Correct.
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Answer:
L = 15.22 cm
W = 6.11 cm
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Done.