Problem
For the given functions, find \( (f \circ g)(x) \) and \( (g \circ f)(x) \) and the domain of each. \[ f(x)=7 x+3, g(x)=\sqrt{x} \] \[ (f \circ g)(x)= \]
Solution
Step 1 ：\( (f \circ g)(x) = f(g(x)) \)
Step 2 ：\( = f(\sqrt{x}) \)
Step 3 ：\( = 7(\sqrt{x}) + 3 \)
