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Haskell Where clause

roots :: (Float, Float, Float) -> (Float, Float)  
roots (a,b,c) = (x1, x2) where 
   x1 = e + sqrt d / (2 * a) 
   x2 = e - sqrt d / (2 * a) 
   d = b * b - 4 * a * c  
   e = - b / (2 * a)  
main = do 
   putStrLn "The roots of our Polynomial equation are:" 
   print (roots(1,-8,6))

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