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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(3*x^2-(9*x)-5)/(x-2) = 0
(3*x^2-9*x-5)/(x-2) = 0
3*x^2-9*x-5 = 0
3*x^2-9*x-5 = 0
DELTA = (-9)^2-(-5*3*4)
DELTA = 141
DELTA > 0
x = (141^(1/2)+9)/(2*3) or x = (9-141^(1/2))/(2*3)
x = (141^(1/2)+9)/6 or x = (9-141^(1/2))/6
(x-((9-141^(1/2))/6))*(x-((141^(1/2)+9)/6)) = 0
((x-((9-141^(1/2))/6))*(x-((141^(1/2)+9)/6)))/(x-2) = 0
( x-((141^(1/2)+9)/6) )
x-((141^(1/2)+9)/6) = 0 // + (141^(1/2)+9)/6
x = (141^(1/2)+9)/6
( x-((9-141^(1/2))/6) )
x-((9-141^(1/2))/6) = 0 // + (9-141^(1/2))/6
x = (9-141^(1/2))/6
x in { (141^(1/2)+9)/6, (9-141^(1/2))/6 }
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