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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(x^2+9*x+11)/(x+5) = 0
x^2+9*x+11 = 0
x^2+9*x+11 = 0
DELTA = 9^2-(1*4*11)
DELTA = 37
DELTA > 0
x = (37^(1/2)-9)/(1*2) or x = (-37^(1/2)-9)/(1*2)
x = (37^(1/2)-9)/2 or x = (-(37^(1/2)+9))/2
(x+(37^(1/2)+9)/2)*(x-((37^(1/2)-9)/2)) = 0
((x+(37^(1/2)+9)/2)*(x-((37^(1/2)-9)/2)))/(x+5) = 0
( x+(37^(1/2)+9)/2 )
x+(37^(1/2)+9)/2 = 0 // - (37^(1/2)+9)/2
x = -((37^(1/2)+9)/2)
( x-((37^(1/2)-9)/2) )
x-((37^(1/2)-9)/2) = 0 // + (37^(1/2)-9)/2
x = (37^(1/2)-9)/2
x in { -((37^(1/2)+9)/2), (37^(1/2)-9)/2 }
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