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k in (-oo:+oo)
k*(((1/4)*k^3)/8)-(1/4) = 0
k*(((1/4)*k^3)/8)-1/4 = 0
1/32*k^4 = 1/4 // : 1/32
k^4 = 8
k^4 = 8 // ^ 1/4
abs(k) = 8^(1/4)
k = 8^(1/4) or k = -8^(1/4)
k in { 8^(1/4), -8^(1/4) }
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