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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 54/x-x+2 // - 54/x-x+2
x+x-(54/x)-2 = 0
x+x-54*x^-1-2 = 0
2*x^1-54*x^-1-2*x^0 = 0
(2*x^2-2*x^1-54*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-2*x^1-54*x^0) = 0
x^1
2*x^2-2*x-54 = 0
2*x^2-2*x-54 = 0
DELTA = (-2)^2-(-54*2*4)
DELTA = 436
DELTA > 0
x = (436^(1/2)+2)/(2*2) or x = (2-436^(1/2))/(2*2)
x = (2*109^(1/2)+2)/4 or x = (2-2*109^(1/2))/4
x in { (2-2*109^(1/2))/4, (2*109^(1/2)+2)/4}
x in { (2-2*109^(1/2))/4, (2*109^(1/2)+2)/4 }
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