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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z+8/z-9 = 11/(-7) // - 11/(-7)
z+8/z-(11/(-7))-9 = 0
z+8/z+11/7-9 = 0
1*z^1+8*z^-1-52/7*z^0 = 0
(1*z^2-52/7*z^1+8*z^0)/(z^1) = 0 // * z^2
z^1*(1*z^2-52/7*z^1+8*z^0) = 0
z^1
z^2+(-52/7)*z+8 = 0
z^2+(-52/7)*z+8 = 0
DELTA = (-52/7)^2-(1*4*8)
DELTA = 1136/49
DELTA > 0
z = ((1136/49)^(1/2)-(-52/7))/(1*2) or z = (-(-52/7)-(1136/49)^(1/2))/(1*2)
z = ((1136/49)^(1/2)+52/7)/2 or z = (52/7-(1136/49)^(1/2))/2
z in { (52/7-(1136/49)^(1/2))/2, ((1136/49)^(1/2)+52/7)/2}
z in { (52/7-(1136/49)^(1/2))/2, ((1136/49)^(1/2)+52/7)/2 }
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