For the function f(x)=9−x2f(x) = \sqrt{9 - x^2}f(x)=9−x2, what is the domain?
x≥3x \ge 3x≥3
−3≤x≤3-3 \le x \le 3−3≤x≤3
x∈Rx \in \mathbb{R}x∈R
x≤−3x \le -3x≤−3