Question

$\sqrt{2x} +2\leq 5$

Answer 1

$\sqrt{2x} \leq 3 \\ 2x \geq 0 \\ x \geq 0 \\ 2x \leq 9 \\ x \leq 4,5 \\ \left \{ {{x \geq 0} \atop {x \leq 4,5}} \right.$
x∈[0; 4,5]