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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2*(x+1))/x+1 = 0
(x^2*(x+1))/x+(1*x)/x = 0
x^2*(x+1)+1*x = 0
x^3+x^2+x = 0
x^3+x^2+x = 0
x*(x^2+x+1) = 0
x^2+x+1 = 0
DELTA = 1^2-(1*1*4)
DELTA = -3
DELTA < 0
x = 0
x/x = 0
x/x = 0 // * x
x = 0
x = 0
x in { 0}
x belongs to the empty set
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