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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/z-((1/2)*z) = -(3/8) // + 3/8
2/z-((1/2)*z)+3/8 = 0
(-1/2)*z+2/z+3/8 = 0
2*z^-1-1/2*z^1+3/8*z^0 = 0
(3/8*z^1-1/2*z^2+2*z^0)/(z^1) = 0 // * z^2
z^1*(3/8*z^1-1/2*z^2+2*z^0) = 0
z^1
(-1/2)*z^2+(3/8)*z+2 = 0
(-1/2)*z^2+(3/8)*z+2 = 0
DELTA = (3/8)^2-(2*4*(-1/2))
DELTA = 265/64
DELTA > 0
z = ((265/64)^(1/2)-(3/8))/(2*(-1/2)) or z = (-(3/8)-(265/64)^(1/2))/(2*(-1/2))
z = 3/8-(265/64)^(1/2) or z = (265/64)^(1/2)+3/8
z in { 3/8-(265/64)^(1/2), (265/64)^(1/2)+3/8}
z in { 3/8-(265/64)^(1/2), (265/64)^(1/2)+3/8 }
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