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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^-1)/2-((9*x^1)/2)+(3^3)/2 = 0
(-9/2)*x+(6*x^-1)/2+(3^3)/2 = 0
3*x^-1-9/2*x^1+27/2*x^0 = 0
(27/2*x^1-9/2*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(27/2*x^1-9/2*x^2+3*x^0) = 0
x^1
(-9/2)*x^2+(27/2)*x+3 = 0
(-9/2)*x^2+(27/2)*x+3 = 0
DELTA = (27/2)^2-(3*4*(-9/2))
DELTA = 945/4
DELTA > 0
x = ((945/4)^(1/2)-(27/2))/(2*(-9/2)) or x = (-(27/2)-(945/4)^(1/2))/(2*(-9/2))
x = ((945/4)^(1/2)-27/2)/(-9) or x = ((945/4)^(1/2)+27/2)/9
x in { ((945/4)^(1/2)-27/2)/(-9), ((945/4)^(1/2)+27/2)/9}
x in { ((945/4)^(1/2)-27/2)/(-9), ((945/4)^(1/2)+27/2)/9 }
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