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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/z-5 = (2/0.5)*z+7 // - (2/0.5)*z+7
2/z-((2/0.5)*z)-7-5 = 0
2/z-4*z-7-5 = 0
2*z^-1-4*z^1-12*z^0 = 0
(2*z^0-4*z^2-12*z^1)/(z^1) = 0 // * z^2
z^1*(2*z^0-4*z^2-12*z^1) = 0
z^1
2-4*z^2-12*z = 0
2-4*z^2-12*z = 0
DELTA = (-12)^2-(-4*2*4)
DELTA = 176
DELTA > 0
z = (176^(1/2)+12)/(-4*2) or z = (12-176^(1/2))/(-4*2)
z = (4*11^(1/2)+12)/(-8) or z = (12-4*11^(1/2))/(-8)
z in { (4*11^(1/2)+12)/(-8), (12-4*11^(1/2))/(-8)}
z in { (4*11^(1/2)+12)/(-8), (12-4*11^(1/2))/(-8) }
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