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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(6/x)-9 = 0
x-6*x^-1-9 = 0
1*x^1-6*x^-1-9*x^0 = 0
(1*x^2-9*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-9*x^1-6*x^0) = 0
x^1
x^2-9*x-6 = 0
x^2-9*x-6 = 0
DELTA = (-9)^2-(-6*1*4)
DELTA = 105
DELTA > 0
x = (105^(1/2)+9)/(1*2) or x = (9-105^(1/2))/(1*2)
x = (105^(1/2)+9)/2 or x = (9-105^(1/2))/2
x in { (9-105^(1/2))/2, (105^(1/2)+9)/2}
x in { (9-105^(1/2))/2, (105^(1/2)+9)/2 }
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