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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/4)*x+2/x-(5/1) = 0
(1/4)*x+2/x-5 = 0
1/4*x^1+2*x^-1-5*x^0 = 0
(1/4*x^2-5*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(1/4*x^2-5*x^1+2*x^0) = 0
x^1
(1/4)*x^2-5*x+2 = 0
(1/4)*x^2-5*x+2 = 0
DELTA = (-5)^2-(2*4*(1/4))
DELTA = 23
DELTA > 0
x = (23^(1/2)+5)/(2*(1/4)) or x = (5-23^(1/2))/(2*(1/4))
x = 2*(23^(1/2)+5) or x = 2*(5-23^(1/2))
x in { 2*(5-23^(1/2)), 2*(23^(1/2)+5)}
x in { 2*(5-23^(1/2)), 2*(23^(1/2)+5) }
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