Hi,



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 

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