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3^(x + 2) = 3^x . 3^2 = 9 . 3^x
3^(x + 1) = 3 . 3^x
Extraemos 3^x como factor común:
3^x (9 + 3 +1) = 13 . 3^x = 13/9
Por lo tanto 3^x = 1/9; aplicamos logaritmos de cualquier base.
x log(3) = log(1/9)
x = log(1/9) / log(3) = - 2
Saludos Herminio