(15 points) Using the method of u-substitution, (3x - 5)4 dx = f(u) du where u = (enter a function of a) du da (enter a function of ac) = (enter a number) b = (enter a number) f ( u) = (enter a function of u). The value of the original integral is Note: You can earn full credit if the last answer box is correct and all other answer boxes are either blank or c