Question 849096
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Hi,
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Let x represent the width
Question states***
 (2x+2)x = 40ft^2
 2x^2 + 2x - 40 = 0
 x^2 + x - 20 = 0
(x+5)(x-4) = 0     (Tossing out the negative solution for unit measure)
    x = 4ft, the width.  The length is 10ft