Question

$\frac{1}{4} \leqslant {2}^{x - 3} \leqslant \frac{1}{2}$
alguém responder pfv?

Answer 1

y = x - 3
1/4 = 2^(-2)
2^y>=2^(-2)
y>=-2
x-3>=-2
x>=1
1/2 = 2^(-1)
2^(-1)>=2^y
-1>=y
-1>=x-3
2>=x

2>=x>=1