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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(18/6)*n = 6/n // - 6/n
(18/6)*n-(6/n) = 0
(18/6)*n-6*n^-1 = 0
3*n^1-6*n^-1 = 0
(3*n^2-6*n^0)/(n^1) = 0 // * n^2
n^1*(3*n^2-6*n^0) = 0
n^1
3*n^2-6 = 0
3*n^2-6 = 0
DELTA = 0^2-(-6*3*4)
DELTA = 72
DELTA > 0
n = (72^(1/2)+0)/(2*3) or n = (0-72^(1/2))/(2*3)
n = 2^(1/2) or n = -2^(1/2)
n in { -2^(1/2), 2^(1/2)}
n in { -2^(1/2), 2^(1/2) }
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