Posto x > 0
log_2 x^2 = 2 log_2 x = 2 t
t^2 + 2t - 8 = 0
t^2 + 4t - 2t - 8 = 0
t(t + 4) - 2(t + 4) = 0
(t + 4) (t - 2) = 0
t = -4 V t = 2
log_2 x = -4 => x = 2^(-4) = 1/16
log_2 x = 2 => x = 2^2 = 4
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