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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(13/4)*x-3 = 3/x // - 3/x
(13/4)*x-(3/x)-3 = 0
(13/4)*x-3*x^-1-3 = 0
13/4*x^1-3*x^-1-3*x^0 = 0
(13/4*x^2-3*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(13/4*x^2-3*x^1-3*x^0) = 0
x^1
(13/4)*x^2-3*x-3 = 0
(13/4)*x^2-3*x-3 = 0
DELTA = (-3)^2-(-3*4*(13/4))
DELTA = 48
DELTA > 0
x = (48^(1/2)+3)/(2*(13/4)) or x = (3-48^(1/2))/(2*(13/4))
x = 2/13*(4*3^(1/2)+3) or x = 2/13*(3-4*3^(1/2))
x in { 2/13*(3-4*3^(1/2)), 2/13*(4*3^(1/2)+3)}
x in { 2/13*(3-4*3^(1/2)), 2/13*(4*3^(1/2)+3) }
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