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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(3*x^2+11*x+1)/(x-3) = 0
3*x^2+11*x+1 = 0
3*x^2+11*x+1 = 0
DELTA = 11^2-(1*3*4)
DELTA = 109
DELTA > 0
x = (109^(1/2)-11)/(2*3) or x = (-109^(1/2)-11)/(2*3)
x = (109^(1/2)-11)/6 or x = (-(109^(1/2)+11))/6
(x+(109^(1/2)+11)/6)*(x-((109^(1/2)-11)/6)) = 0
((x+(109^(1/2)+11)/6)*(x-((109^(1/2)-11)/6)))/(x-3) = 0
( x+(109^(1/2)+11)/6 )
x+(109^(1/2)+11)/6 = 0 // - (109^(1/2)+11)/6
x = -((109^(1/2)+11)/6)
( x-((109^(1/2)-11)/6) )
x-((109^(1/2)-11)/6) = 0 // + (109^(1/2)-11)/6
x = (109^(1/2)-11)/6
x in { -((109^(1/2)+11)/6), (109^(1/2)-11)/6 }
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