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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64 = 2/x-x // - 2/x-x
x-(2/x)+64 = 0
x-2*x^-1+64 = 0
1*x^1-2*x^-1+64*x^0 = 0
(1*x^2+64*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+64*x^1-2*x^0) = 0
x^1
x^2+64*x-2 = 0
x^2+64*x-2 = 0
DELTA = 64^2-(-2*1*4)
DELTA = 4104
DELTA > 0
x = (4104^(1/2)-64)/(1*2) or x = (-4104^(1/2)-64)/(1*2)
x = (6*114^(1/2)-64)/2 or x = (-6*114^(1/2)-64)/2
x in { (-6*114^(1/2)-64)/2, (6*114^(1/2)-64)/2}
x in { (-6*114^(1/2)-64)/2, (6*114^(1/2)-64)/2 }
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