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((4-(9*x^4))^1)/2 = 0
(4-9*x^4)/2 = 0
-9*x^4 = -4 // : -9
x^4 = 4/9
x^4 = 4/9 // ^ 1/4
abs(x) = (4/9)^(1/4)
x = (4/9)^(1/4) or x = -(4/9)^(1/4)
x in { (4/9)^(1/4), -(4/9)^(1/4) }
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