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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(2/x) = 54 // - 54
2*x-(2/x)-54 = 0
2*x-2*x^-1-54 = 0
2*x^1-2*x^-1-54*x^0 = 0
(2*x^2-54*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-54*x^1-2*x^0) = 0
x^1
2*x^2-54*x-2 = 0
2*x^2-54*x-2 = 0
DELTA = (-54)^2-(-2*2*4)
DELTA = 2932
DELTA > 0
x = (2932^(1/2)+54)/(2*2) or x = (54-2932^(1/2))/(2*2)
x = (2*733^(1/2)+54)/4 or x = (54-2*733^(1/2))/4
x in { (54-2*733^(1/2))/4, (2*733^(1/2)+54)/4}
x in { (54-2*733^(1/2))/4, (2*733^(1/2)+54)/4 }
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