A = lw
96 = (w+4)(w)
w^2 + 4w -96 = 0
(w +12 )(w-8) =0
w=-12 cannot have a neg value here
w = 8
so l = 12
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Illustration below ). The area of the piece of sheet is 21 ft . Find its length and width. (Hint : Area of the rectangle = Length ×Width )
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