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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(1/x) = 5 // - 5
2*x-(1/x)-5 = 0
2*x-x^-1-5 = 0
2*x^1-1*x^-1-5*x^0 = 0
(2*x^2-5*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-5*x^1-1*x^0) = 0
x^1
2*x^2-5*x-1 = 0
2*x^2-5*x-1 = 0
DELTA = (-5)^2-(-1*2*4)
DELTA = 33
DELTA > 0
x = (33^(1/2)+5)/(2*2) or x = (5-33^(1/2))/(2*2)
x = (33^(1/2)+5)/4 or x = (5-33^(1/2))/4
x in { (5-33^(1/2))/4, (33^(1/2)+5)/4}
x in { (5-33^(1/2))/4, (33^(1/2)+5)/4 }
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