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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = (5/2)*x // - (5/2)*x
3/x-((5/2)*x) = 0
(-5/2)*x+3/x = 0
3*x^-1-5/2*x^1 = 0
(3*x^0-5/2*x^2)/(x^1) = 0 // * x^2
x^1*(3*x^0-5/2*x^2) = 0
x^1
(-5/2)*x^2+3 = 0
(-5/2)*x^2+3 = 0
DELTA = 0^2-(3*4*(-5/2))
DELTA = 30
DELTA > 0
x = (30^(1/2)+0)/(2*(-5/2)) or x = (0-30^(1/2))/(2*(-5/2))
x = (30^(1/2))/(-5) or x = (30^(1/2))/5
x in { (30^(1/2))/(-5), (30^(1/2))/5}
x in { (30^(1/2))/(-5), (30^(1/2))/5 }
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