pongo: LOG(2,x^2) = t
1/4·t^2 + t - 8 = 0
(t - 4)·(t + 8)/4 = 0
t = -8 ∨ t = 4
LOG(2,x^2) = -8 :
2^(-8) = x^2---> x = - 1/16 ∨ x = 1/16
LOG(2,x^2) = 4
2^4 = x^2----> x = -4 ∨ x = 4
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