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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
11/n = 8-n // - 8-n
n+11/n-8 = 0
1*n^1+11*n^-1-8*n^0 = 0
(1*n^2-8*n^1+11*n^0)/(n^1) = 0 // * n^2
n^1*(1*n^2-8*n^1+11*n^0) = 0
n^1
n^2-8*n+11 = 0
n^2-8*n+11 = 0
DELTA = (-8)^2-(1*4*11)
DELTA = 20
DELTA > 0
n = (20^(1/2)+8)/(1*2) or n = (8-20^(1/2))/(1*2)
n = (2*5^(1/2)+8)/2 or n = (8-2*5^(1/2))/2
n in { (8-2*5^(1/2))/2, (2*5^(1/2)+8)/2}
n in { (8-2*5^(1/2))/2, (2*5^(1/2)+8)/2 }
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