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x in (-oo:+oo)
(1/4)*x^8 < 9 // - 9
(1/4)*x^8-9 < 0
1/4*x^8 < 9
1/4*x^8 < 9 // : 1/4
x^8 < 9/1/4
x^8 < 36
x^8 < 36 // ^ 1/8
abs(x) < 36^(1/8)
x in (-36^(1/8):36^(1/8))
x in (-36^(1/8):36^(1/8))
(-36^(1/8):36^(1/8))
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