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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/2)*x-1 = 3/x // - 3/x
(5/2)*x-(3/x)-1 = 0
(5/2)*x-3*x^-1-1 = 0
5/2*x^1-3*x^-1-1*x^0 = 0
(5/2*x^2-1*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(5/2*x^2-1*x^1-3*x^0) = 0
x^1
(5/2)*x^2-x-3 = 0
(5/2)*x^2-x-3 = 0
DELTA = (-1)^2-(-3*4*(5/2))
DELTA = 31
DELTA > 0
x = (31^(1/2)+1)/(2*(5/2)) or x = (1-31^(1/2))/(2*(5/2))
x = (31^(1/2)+1)/5 or x = (1-31^(1/2))/5
x in { (1-31^(1/2))/5, (31^(1/2)+1)/5}
x in { (1-31^(1/2))/5, (31^(1/2)+1)/5 }
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