Use a change of variables to evaluate the following indefinite integral. [ ( Vx + 2) 3 dx 21x Determine a change of variables from x to u. Choose the correct answer below. O A. U= 1X OB. u= 1X +2 O C. U= - 1 21X OD. U= (VX +2)3 Write the integral in terms of u. ( ( VX + 2) 3 2VX dx = () du Evaluate the integral. [ ( VX + 2) 3 dx = 21x