Let f(x)=x−5f(x) = \sqrt{x-5}f(x)=x−5 and g(x)=x2+1g(x) = x^2 + 1g(x)=x2+1. What is the domain of the composite function h(x)=f(g(x))h(x) = f(g(x))h(x)=f(g(x))?
x≥5x \ge 5x≥5
x≥2x \ge 2x≥2 or x≤−2x \le -2x≤−2
x≥2x \ge 2x≥2
x∈Rx \in \mathbb{R}x∈R