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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/6 = n-(11/n) // - n-(11/n)
11/n-n+1/6 = 0
11*n^-1-1*n^1+1/6*n^0 = 0
(1/6*n^1-1*n^2+11*n^0)/(n^1) = 0 // * n^2
n^1*(1/6*n^1-1*n^2+11*n^0) = 0
n^1
(1/6)*n-n^2+11 = 0
(1/6)*n-n^2+11 = 0
DELTA = (1/6)^2-(-1*4*11)
DELTA = 1585/36
DELTA > 0
n = ((1585/36)^(1/2)-(1/6))/(-1*2) or n = (-(1/6)-(1585/36)^(1/2))/(-1*2)
n = ((1585/36)^(1/2)-1/6)/(-2) or n = ((1585/36)^(1/2)+1/6)/2
n in { ((1585/36)^(1/2)-1/6)/(-2), ((1585/36)^(1/2)+1/6)/2}
n in { ((1585/36)^(1/2)-1/6)/(-2), ((1585/36)^(1/2)+1/6)/2 }
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