Step 1 :Define the functions \(f(x)\) and \(g(x)\) as given in the problem.
Step 2 :Calculate the value of \(f(g(4))\).
Step 3 :Calculate the value of \(g(f(-3))\).
Step 4 :The calculated values are 38 and 43 respectively.
Step 5 :Final Answer: \n(a) \(f(g(4)) = \boxed{38}\) \n(b) \(g(f(-3)) = \boxed{43}\)