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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2-16)/x-4 = 0
(x^2-16)/x+(-4*x)/x = 0
x^2-4*x-16 = 0
x^2-4*x-16 = 0
x^2-4*x-16 = 0
DELTA = (-4)^2-(-16*1*4)
DELTA = 80
DELTA > 0
x = (80^(1/2)+4)/(1*2) or x = (4-80^(1/2))/(1*2)
x = (4*5^(1/2)+4)/2 or x = (4-4*5^(1/2))/2
(x-((4-4*5^(1/2))/2))*(x-((4*5^(1/2)+4)/2)) = 0
((x-((4-4*5^(1/2))/2))*(x-((4*5^(1/2)+4)/2)))/x = 0
((x-((4-4*5^(1/2))/2))*(x-((4*5^(1/2)+4)/2)))/x = 0 // * x
(x-((4-4*5^(1/2))/2))*(x-((4*5^(1/2)+4)/2)) = 0
( x-((4*5^(1/2)+4)/2) )
x-((4*5^(1/2)+4)/2) = 0 // + (4*5^(1/2)+4)/2
x = (4*5^(1/2)+4)/2
( x-((4-4*5^(1/2))/2) )
x-((4-4*5^(1/2))/2) = 0 // + (4-4*5^(1/2))/2
x = (4-4*5^(1/2))/2
x in { (4*5^(1/2)+4)/2, (4-4*5^(1/2))/2 }
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