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x in (-oo:+oo)
(x^4)/3-((9*x^2)/3)+8 = 0
(x^4)/3-3*x^2+8 = 0
1/3*x^4-3*x^2+8 = 0
t_1 = x^2
1/3*t_1^2-3*t_1^1+8 = 0
1/3*t_1^2-3*t_1+8 = 0
DELTA = (-3)^2-(1/3*4*8)
DELTA = -5/3
DELTA < 0
x belongs to the empty set
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