Evaluate 24x' (4x6 + 1)'dx using the method of integration by substitution. (a) What is the simplest choice of u, as a function of , that allows you to solve the problem using the substitution method? U = (b) What is the answer, after integrating, in terms of u? Answer (as a function of u): + C (c) What is the answer in terms of x? Answer (as a function of x): + C