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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
64/s = s // - s
64/s-s = 0
64*s^-1-1*s^1 = 0
(64*s^0-1*s^2)/(s^1) = 0 // * s^2
s^1*(64*s^0-1*s^2) = 0
s^1
64-s^2 = 0
64-s^2 = 0
DELTA = 0^2-(-1*4*64)
DELTA = 256
DELTA > 0
s = (256^(1/2)+0)/(-1*2) or s = (0-256^(1/2))/(-1*2)
s = -8 or s = 8
s in { -8, 8}
s in { -8, 8 }
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