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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-x-6 = 0
6*x^-1-1*x^1-6*x^0 = 0
(6*x^0-1*x^2-6*x^1)/(x^1) = 0 // * x^2
x^1*(6*x^0-1*x^2-6*x^1) = 0
x^1
6-x^2-6*x = 0
6-x^2-6*x = 0
DELTA = (-6)^2-(-1*4*6)
DELTA = 60
DELTA > 0
x = (60^(1/2)+6)/(-1*2) or x = (6-60^(1/2))/(-1*2)
x = (2*15^(1/2)+6)/(-2) or x = (6-2*15^(1/2))/(-2)
x in { (2*15^(1/2)+6)/(-2), (6-2*15^(1/2))/(-2)}
x in { (2*15^(1/2)+6)/(-2), (6-2*15^(1/2))/(-2) }
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