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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 2*x-(88/x)-5 // - 2*x-(88/x)-5
x-(2*x)+88/x+5 = 0
x-2*x+88/x+5 = 0
88*x^-1-1*x^1+5*x^0 = 0
(5*x^1-1*x^2+88*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-1*x^2+88*x^0) = 0
x^1
5*x-x^2+88 = 0
5*x-x^2+88 = 0
DELTA = 5^2-(-1*4*88)
DELTA = 377
DELTA > 0
x = (377^(1/2)-5)/(-1*2) or x = (-377^(1/2)-5)/(-1*2)
x = (377^(1/2)-5)/(-2) or x = (377^(1/2)+5)/2
x in { (377^(1/2)-5)/(-2), (377^(1/2)+5)/2}
x in { (377^(1/2)-5)/(-2), (377^(1/2)+5)/2 }
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