z+8/z-4

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Solution for z+8/z-4 equation: 


D( z )

z = 0

z = 0

z = 0

z in (-oo:0) U (0:+oo)

z+8/z-4 = 0

1*z^1+8*z^-1-4*z^0 = 0

(1*z^2-4*z^1+8*z^0)/(z^1) = 0 // * z^2

z^1*(1*z^2-4*z^1+8*z^0) = 0

z^1

z^2-4*z+8 = 0

z^2-4*z+8 = 0

DELTA = (-4)^2-(1*4*8)

DELTA = -16

DELTA < 0

z in { } 

z belongs to the empty set

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