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D( s )
s^2 = 0
s^2 = 0
s^2 = 0
1*s^2 = 0 // : 1
s^2 = 0
s = 0
s in (-oo:0) U (0:+oo)
2*s-(250/(s^2)) = 0
2*s-250*s^-2 = 0
2*s^1-250*s^-2 = 0
(2*s^3-250*s^0)/(s^2) = 0 // * s^4
s^2*(2*s^3-250*s^0) = 0
s^2
2*s^3-250 = 0
{ 1, -1, 2, -2, 5, -5, 10, -10, 25, -25, 50, -50, 125, -125, 250, -250 }
1
s = 1
2*s^3-250 = -248
1
-1
s = -1
2*s^3-250 = -252
-1
2
s = 2
2*s^3-250 = -234
2
-2
s = -2
2*s^3-250 = -266
-2
5
s = 5
2*s^3-250 = 0
5
s-5
2*s^2+10*s+50
2*s^3-250
s-5
10*s^2-2*s^3
10*s^2-250
50*s-10*s^2
50*s-250
250-50*s
0
2*s^2+10*s+50 = 0
DELTA = 10^2-(2*4*50)
DELTA = -300
DELTA < 0
s in { 5}
s = 5
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