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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(5/x)+11/x-4-4 = 0
2*x-5*x^-1+11/x-4-4 = 0
2*x^1+6*x^-1-8*x^0 = 0
(2*x^2-8*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-8*x^1+6*x^0) = 0
x^1
2*x^2-8*x+6 = 0
2*x^2-8*x+6 = 0
DELTA = (-8)^2-(2*4*6)
DELTA = 16
DELTA > 0
x = (16^(1/2)+8)/(2*2) or x = (8-16^(1/2))/(2*2)
x = 3 or x = 1
x in { 1, 3}
x in { 1, 3 }
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