Use a change of variables or the accompanying table to evaluate the following indefinite integral. 1 7x- 1 dx Click the icon to view the table of general integration formulas. Determine a change of variables from x to u. Choose the correct answer below. OA. U= 7x - 1 O B. U= 7x O c. U=7 OD. U= 7x - 1 Write the integral in terms of u. 7 x - 1 dx = () du Evaluate the integral. 7x - dx =