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