LOGa(x+1)=2
(è logaritmo di base a)
* (log(a, x + 1) = 2) & (a != 1) ≡≡ (a^log(a, x + 1) = a^2) & (a != 1) ≡≡ (x + 1 = a^2) & (a != 1) ≡≡ (x = a^2 - 1) & (a != 1)
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