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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n = (5*n+4)/n // - (5*n+4)/n
n-((5*n+4)/n) = 0
(-1*(5*n+4))/n+n = 0
(-1*(5*n+4))/n+(n^2)/n = 0
n^2-1*(5*n+4) = 0
n^2-5*n-4 = 0
n^2-5*n-4 = 0
n^2-5*n-4 = 0
DELTA = (-5)^2-(-4*1*4)
DELTA = 41
DELTA > 0
n = (41^(1/2)+5)/(1*2) or n = (5-41^(1/2))/(1*2)
n = (41^(1/2)+5)/2 or n = (5-41^(1/2))/2
(n-((5-41^(1/2))/2))*(n-((41^(1/2)+5)/2)) = 0
((n-((5-41^(1/2))/2))*(n-((41^(1/2)+5)/2)))/n = 0
((n-((5-41^(1/2))/2))*(n-((41^(1/2)+5)/2)))/n = 0 // * n
(n-((5-41^(1/2))/2))*(n-((41^(1/2)+5)/2)) = 0
( n-((41^(1/2)+5)/2) )
n-((41^(1/2)+5)/2) = 0 // + (41^(1/2)+5)/2
n = (41^(1/2)+5)/2
( n-((5-41^(1/2))/2) )
n-((5-41^(1/2))/2) = 0 // + (5-41^(1/2))/2
n = (5-41^(1/2))/2
n in { (41^(1/2)+5)/2, (5-41^(1/2))/2 }
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