Question

Resolva essa equação exponencial:

3^2-x=1\27

Answer 1

3^2-x = 1/3^3
3^2-x = 3^-3
2-x = -3
-x = -5
x = 5

Answer 2

$3^{2-x}= \frac{1}{27}\\\\3^{2-x}=27^{-1}\\\\3^{2-x}= (3^{3})^{-1}\\\\3^{2-x}=3^{-3}\\\\2-x=-3\\-x=-3-2\\-x=-5\\\boxed{x=5}$