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a in (-oo:+oo)
(a^4)/2 = 10.8 // - 10.8
(a^4)/2-10.8 = 0
1/2*a^4 = 10.8 // : 1/2
a^4 = 21.6
a^4 = 21.6 // ^ 1/4
abs(a) = 21.6^(1/4)
a = 21.6^(1/4) or a = -21.6^(1/4)
a in { 21.6^(1/4), -21.6^(1/4) }
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