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z in (-oo:+oo)
z = (-5/8)*z*z // - (-5/8)*z*z
z-((-5/8)*z*z) = 0
(5/8)*z^2+z = 0
5/8*z^2+z = 0
DELTA = 1^2-(0*5/8*4)
DELTA = 1
DELTA > 0
z = (1^(1/2)-1)/(5/8*2) or z = (-1^(1/2)-1)/(5/8*2)
z = 0 or z = -8/5
z in { -8/5, 0 }
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