Question

$2 ^{x-3} = \frac{1}{8}$

Answer 1

$2^{x-3}=\frac{1}{8}\\ \\ 2^{x-3}=\frac{1}{2^3}\\ \\ 2^{x-3}=2^{-3}\\ \\ x-3=-3\\ \\ x=0$