Use the functions f(x) = 2x and g(x) = x² + 1 to find the value of each expression.
1. f(3) + g(4)
2. f(g(3))
3. g(f(3))
4. g(3) + f(4)
5. f(2) + 3 · g(4)
6. f(3) – 2 · g(1)
7. f(f(5))
8. g(g(4))