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Let L is the length and W is the width of the rectangle. We have; L = W - 8 the area is L x W = 9

or (W - 8)W = 9 --->>>  W^2 -8W = 9   --->>>  W^2-8W-9=0 --->>>>  (W-9)(W+1) = 0

so W=9 or W=-1 the solution W=-1 is rejected since we can not have a negative width.

So W=9 and L=9-8=1 so area is 9*1=9 sq units
by Level 5 User (13.1k points)

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