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the length of the swimming pool is 8 meter longer than its width and the area is 105 meter

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AnneCviz
Let x be the the width of the pool
     x+8 be the length

A = l · w

105 = (x+8)x
105 = x² +8x
   0 = x² +8x -105
   0 = (x+15)(x-7)
x = -15 ; x = 7

Width = 7m
Length = 15m

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