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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
10/z = z/2 // - z/2
10/z-(z/2) = 0
10*z^-1-1/2*z^1 = 0
(10*z^0-1/2*z^2)/(z^1) = 0 // * z^2
z^1*(10*z^0-1/2*z^2) = 0
z^1
(-1/2)*z^2+10 = 0
(-1/2)*z^2+10 = 0
DELTA = 0^2-(4*10*(-1/2))
DELTA = 20
DELTA > 0
z = (20^(1/2)+0)/(2*(-1/2)) or z = (0-20^(1/2))/(2*(-1/2))
z = -2*5^(1/2) or z = 2*5^(1/2)
z in { -2*5^(1/2), 2*5^(1/2)}
z in { -2*5^(1/2), 2*5^(1/2) }
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