Question

2 (elevado a x+3) =1/8

Answer 1

$2^{x+3}=( \frac{1}{8})^1--> 2^{x+3}=(8)^-^1--> 2^{x+3}=( 2^{3})^-^1$

$2^{x+3}= 2^{-3}$ ---->bases iguais,iguala os expoentes

$x+3=-3 --> x=-3-3-->x=-6$

Verificando:
$2^{-6+3}= 2^{-3}--> 2^{-3}= 2^{-3}$

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