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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(9*x)+18/x-6 = 0
X^2-9*x+18/x-6 = 0
18*x^-1-9*x^1-6*x^0 = 0
(18*x^0-9*x^2-6*x^1)/(x^1) = 0 // * x^2
x^1*(18*x^0-9*x^2-6*x^1) = 0
x^1
18-9*x^2-6*x = 0
18-9*x^2-6*x = 0
DELTA = (-6)^2-(-9*4*18)
DELTA = 684
DELTA > 0
x = (684^(1/2)+6)/(-9*2) or x = (6-684^(1/2))/(-9*2)
x = (6*19^(1/2)+6)/(-18) or x = (6-6*19^(1/2))/(-18)
x in { (6*19^(1/2)+6)/(-18), (6-6*19^(1/2))/(-18)}
x in { (6*19^(1/2)+6)/(-18), (6-6*19^(1/2))/(-18) }
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