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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2-(4*x)-12)/x-2 = 0
(x^2-4*x-12)/x-2 = 0
(x^2-4*x-12)/x+(-2*x)/x = 0
x^2-4*x-2*x-12 = 0
x^2-6*x-12 = 0
x^2-6*x-12 = 0
x^2-6*x-12 = 0
DELTA = (-6)^2-(-12*1*4)
DELTA = 84
DELTA > 0
x = (84^(1/2)+6)/(1*2) or x = (6-84^(1/2))/(1*2)
x = (2*21^(1/2)+6)/2 or x = (6-2*21^(1/2))/2
(x-((6-2*21^(1/2))/2))*(x-((2*21^(1/2)+6)/2)) = 0
((x-((6-2*21^(1/2))/2))*(x-((2*21^(1/2)+6)/2)))/x = 0
((x-((6-2*21^(1/2))/2))*(x-((2*21^(1/2)+6)/2)))/x = 0 // * x
(x-((6-2*21^(1/2))/2))*(x-((2*21^(1/2)+6)/2)) = 0
( x-((2*21^(1/2)+6)/2) )
x-((2*21^(1/2)+6)/2) = 0 // + (2*21^(1/2)+6)/2
x = (2*21^(1/2)+6)/2
( x-((6-2*21^(1/2))/2) )
x-((6-2*21^(1/2))/2) = 0 // + (6-2*21^(1/2))/2
x = (6-2*21^(1/2))/2
x in { (2*21^(1/2)+6)/2, (6-2*21^(1/2))/2 }
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