Question

Aflati multimea B. B={y apartine numerelor nat. | 5< si= 4 la puterea x < si = 64}

Answer 1

$5 \leq 4^{x} \leq 64$

$x=1: 4^{1} =4$
$x=2: 4^{2}=16$
$x=3: 4^{3} =64$

deci B={1,2,3}