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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(2*x)+1 = 5 // - 5
2/x-(2*x)-5+1 = 0
2/x-2*x-5+1 = 0
2*x^-1-2*x^1-4*x^0 = 0
(2*x^0-2*x^2-4*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-2*x^2-4*x^1) = 0
x^1
2-2*x^2-4*x = 0
2-2*x^2-4*x = 0
DELTA = (-4)^2-(-2*2*4)
DELTA = 32
DELTA > 0
x = (32^(1/2)+4)/(-2*2) or x = (4-32^(1/2))/(-2*2)
x = (4*2^(1/2)+4)/(-4) or x = (4-4*2^(1/2))/(-4)
x in { (4*2^(1/2)+4)/(-4), (4-4*2^(1/2))/(-4)}
x in { (4*2^(1/2)+4)/(-4), (4-4*2^(1/2))/(-4) }
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