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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = (18/5)*x-2 // - (18/5)*x-2
3/x-((18/5)*x)+2 = 0
(-18/5)*x+3/x+2 = 0
3*x^-1-18/5*x^1+2*x^0 = 0
(2*x^1-18/5*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-18/5*x^2+3*x^0) = 0
x^1
(-18/5)*x^2+2*x+3 = 0
(-18/5)*x^2+2*x+3 = 0
DELTA = 2^2-(3*4*(-18/5))
DELTA = 236/5
DELTA > 0
x = ((236/5)^(1/2)-2)/(2*(-18/5)) or x = (-(236/5)^(1/2)-2)/(2*(-18/5))
x = -5/36*((236/5)^(1/2)-2) or x = 5/36*((236/5)^(1/2)+2)
x in { -5/36*((236/5)^(1/2)-2), 5/36*((236/5)^(1/2)+2)}
x in { -5/36*((236/5)^(1/2)-2), 5/36*((236/5)^(1/2)+2) }
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