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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12/k = 24*k // - 24*k
12/k-(24*k) = 0
12/k-24*k = 0
12*k^-1-24*k^1 = 0
(12*k^0-24*k^2)/(k^1) = 0 // * k^2
k^1*(12*k^0-24*k^2) = 0
k^1
12-24*k^2 = 0
12-24*k^2 = 0
DELTA = 0^2-(-24*4*12)
DELTA = 1152
DELTA > 0
k = (1152^(1/2)+0)/(-24*2) or k = (0-1152^(1/2))/(-24*2)
k = (-2^(1/2))/2 or k = (2^(1/2))/2
k in { (-2^(1/2))/2, (2^(1/2))/2}
k in { (-2^(1/2))/2, (2^(1/2))/2 }
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