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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = (13/8)*x+3 // - (13/8)*x+3
2/x-((13/8)*x)-3 = 0
(-13/8)*x+2/x-3 = 0
2*x^-1-13/8*x^1-3*x^0 = 0
(2*x^0-13/8*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-13/8*x^2-3*x^1) = 0
x^1
(-13/8)*x^2-3*x+2 = 0
(-13/8)*x^2-3*x+2 = 0
DELTA = (-3)^2-(2*4*(-13/8))
DELTA = 22
DELTA > 0
x = (22^(1/2)+3)/(2*(-13/8)) or x = (3-22^(1/2))/(2*(-13/8))
x = -4/13*(22^(1/2)+3) or x = -4/13*(3-22^(1/2))
x in { -4/13*(22^(1/2)+3), -4/13*(3-22^(1/2))}
x in { -4/13*(22^(1/2)+3), -4/13*(3-22^(1/2)) }
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