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b in (-oo:+oo)
b*((4*b^3)/2)-1 = 0
2*b^4 = 1 // : 2
b^4 = 1/2
b^4 = 1/2 // ^ 1/4
abs(b) = (1/2)^(1/4)
b = (1/2)^(1/4) or b = -(1/2)^(1/4)
b in { (1/2)^(1/4), -(1/2)^(1/4) }
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