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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/n+2 = n/4 // - n/4
12/n-(n/4)+2 = 0
12*n^-1-1/4*n^1+2*n^0 = 0
(2*n^1-1/4*n^2+12*n^0)/(n^1) = 0 // * n^2
n^1*(2*n^1-1/4*n^2+12*n^0) = 0
n^1
(-1/4)*n^2+2*n+12 = 0
(-1/4)*n^2+2*n+12 = 0
DELTA = 2^2-(4*12*(-1/4))
DELTA = 16
DELTA > 0
n = (16^(1/2)-2)/(2*(-1/4)) or n = (-16^(1/2)-2)/(2*(-1/4))
n = -4 or n = 12
n in { -4, 12}
n in { -4, 12 }
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