a) u(x) = 1 + x ; v(x) = 3x + 4
f(x) = u(v(x)) = 1 + (3x + 4)
g(x) = v(u(x)) = 3(1 + x) + 4
b) u(x) = 2 + x ; v(x) = x^2
f(x) = u(v(x)) = 2 + (x^2)
g(x) = v(u(x)) = (2 + x)^2
c) u(x) = x^2 + 1 ; v(x) = 1/x - 1
f(x) = u(v(x)) = (1/x - 1)^2 + 1
g(x) = v(u(x)) = 1/(x^2 + 1) - 1