Question

1.Determinați elementele multimilor B={x € N | -5 _< radical x _< -2}
_< inseamna mai mic sau egal

Si 16 pls am dat poza cu 16
16 a si B
Dau 15 puncte

Answer 1

$\it B=\{x\in\mathbb{N}\Big|\ -5\leq-\sqrt x\leq-2\}\\ \\ \\-5\leq-\sqrt x\leq-2 |_{\cdot(-1)}\Rightarrow 2\leq\sqrt x\leq 5\ \stackrel{x\in\mathbb{N}}{\Longrightarrow}\ B=\{4,\ 5,\ 6,\ ...,\ 25\}$