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a in (-oo:+oo)
(1/4)*a^2 = 10 // - 10
(1/4)*a^2-10 = 0
1/4*a^2 = 10 // : 1/4
a^2 = 40
a^2 = 40 // ^ 1/2
abs(a) = 2*10^(1/2)
a = 2*10^(1/2) or a = -(2*10^(1/2))
a in { 2*10^(1/2), -(2*10^(1/2)) }
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