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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(18/3)*x-3 = 6/x // - 6/x
(18/3)*x-(6/x)-3 = 0
(18/3)*x-6*x^-1-3 = 0
6*x^1-6*x^-1-3*x^0 = 0
(6*x^2-3*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^2-3*x^1-6*x^0) = 0
x^1
6*x^2-3*x-6 = 0
6*x^2-3*x-6 = 0
DELTA = (-3)^2-(-6*4*6)
DELTA = 153
DELTA > 0
x = (153^(1/2)+3)/(2*6) or x = (3-153^(1/2))/(2*6)
x = (3*17^(1/2)+3)/12 or x = (3-3*17^(1/2))/12
x in { (3-3*17^(1/2))/12, (3*17^(1/2)+3)/12}
x in { (3-3*17^(1/2))/12, (3*17^(1/2)+3)/12 }
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