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D( n )
n^2+6*n+5 = 0
n^2+6*n+5 = 0
n^2+6*n+5 = 0
n^2+6*n+5 = 0
DELTA = 6^2-(1*4*5)
DELTA = 16
DELTA > 0
n = (16^(1/2)-6)/(1*2) or n = (-16^(1/2)-6)/(1*2)
n = -1 or n = -5
n in (-oo:-5) U (-5:-1) U (-1:+oo)
1/(n^2+6*n+5) = 0
n^2+6*n+5 = 0
n^2+6*n+5 = 0
DELTA = 6^2-(1*4*5)
DELTA = 16
DELTA > 0
n = (16^(1/2)-6)/(1*2) or n = (-16^(1/2)-6)/(1*2)
n = -1 or n = -5
(n+5)*(n+1) = 0
1/((n+5)*(n+1)) = 0
n belongs to the empty set
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