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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
1/z = (8/11)*z // - (8/11)*z
1/z-((8/11)*z) = 0
(-8/11)*z+1/z = 0
1*z^-1-8/11*z^1 = 0
(1*z^0-8/11*z^2)/(z^1) = 0 // * z^2
z^1*(1*z^0-8/11*z^2) = 0
z^1
(-8/11)*z^2+1 = 0
(-8/11)*z^2+1 = 0
DELTA = 0^2-(1*4*(-8/11))
DELTA = 32/11
DELTA > 0
z = ((32/11)^(1/2)+0)/(2*(-8/11)) or z = (0-(32/11)^(1/2))/(2*(-8/11))
z = -11/16*(32/11)^(1/2) or z = 11/16*(32/11)^(1/2)
z in { -11/16*(32/11)^(1/2), 11/16*(32/11)^(1/2)}
z in { -11/16*(32/11)^(1/2), 11/16*(32/11)^(1/2) }
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