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D( X )
X+6 = 0
X+6 = 0
X+6 = 0
X+6 = 0 // - 6
X = -6
X in (-oo:-6) U (-6:+oo)
(6*X^2-(29*X)+18)/(X+6) = 0
(6*X^2-29*X+18)/(X+6) = 0
6*X^2-29*X+18 = 0
6*X^2-29*X+18 = 0
DELTA = (-29)^2-(4*6*18)
DELTA = 409
DELTA > 0
X = (409^(1/2)+29)/(2*6) or X = (29-409^(1/2))/(2*6)
X = (409^(1/2)+29)/12 or X = (29-409^(1/2))/12
(X-((29-409^(1/2))/12))*(X-((409^(1/2)+29)/12)) = 0
((X-((29-409^(1/2))/12))*(X-((409^(1/2)+29)/12)))/(X+6) = 0
( X-((29-409^(1/2))/12) )
X-((29-409^(1/2))/12) = 0 // + (29-409^(1/2))/12
X = (29-409^(1/2))/12
( X-((409^(1/2)+29)/12) )
X-((409^(1/2)+29)/12) = 0 // + (409^(1/2)+29)/12
X = (409^(1/2)+29)/12
X in { (29-409^(1/2))/12, (409^(1/2)+29)/12 }
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