SubArea: Quadratic equations and inequalitiesLevel: BProject ID: 2000000202Accepted: 0Clonable: 0Easy: 1Solve the following inequality. \[ x^{2} + 9\leq 0 \]\(x \in \emptyset \)\(x \in \mathbb{R}\)\(x \in (-3 ;3)\)\(x \in (-\infty ;-3)\cup (3;\infty )\)
