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D( n )
n^2+3*n = 0
n^2+3*n = 0
n^2+3*n = 0
n^2+3*n = 0
DELTA = 3^2-(0*1*4)
DELTA = 9
DELTA > 0
n = (9^(1/2)-3)/(1*2) or n = (-9^(1/2)-3)/(1*2)
n = 0 or n = -3
n in (-oo:-3) U (-3:0) U (0:+oo)
(13*n)/(n^2+3*n) = 0
n^2+3*n = 0
n*(n+3) = 0
n+3 = 0 // - 3
n = -3
n*(n+3) = 0
(13*n)/(n*(n+3)) = 0
13*n = 0 // : 13
n = 0
n in { 0}
n belongs to the empty set
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