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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/2)*x-3 = 10/x // - 10/x
(5/2)*x-(10/x)-3 = 0
(5/2)*x-10*x^-1-3 = 0
5/2*x^1-10*x^-1-3*x^0 = 0
(5/2*x^2-3*x^1-10*x^0)/(x^1) = 0 // * x^2
x^1*(5/2*x^2-3*x^1-10*x^0) = 0
x^1
(5/2)*x^2-3*x-10 = 0
(5/2)*x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*4*(5/2))
DELTA = 109
DELTA > 0
x = (109^(1/2)+3)/(2*(5/2)) or x = (3-109^(1/2))/(2*(5/2))
x = (109^(1/2)+3)/5 or x = (3-109^(1/2))/5
x in { (3-109^(1/2))/5, (109^(1/2)+3)/5}
x in { (3-109^(1/2))/5, (109^(1/2)+3)/5 }
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