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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z/10-(10/z) = 0
z/10-10*z^-1 = 0
1/10*z^1-10*z^-1 = 0
(1/10*z^2-10*z^0)/(z^1) = 0 // * z^2
z^1*(1/10*z^2-10*z^0) = 0
z^1
(1/10)*z^2-10 = 0
(1/10)*z^2-10 = 0
DELTA = 0^2-(-10*4*(1/10))
DELTA = 4
DELTA > 0
z = (4^(1/2)+0)/(2*(1/10)) or z = (0-4^(1/2))/(2*(1/10))
z = 10 or z = -10
z in { -10, 10}
z in { -10, 10 }
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