A popular video game retailer develops apps. The total profit, in dollars per day, after x days can be modeled by the function R(x) = 2x^3 - 20x^2 + 26x + 48. The total cost, in dollars per day, after x days, can be modeled by the function A(x) = x^2 - 2x - 3. After how many days does the retailer start making money?
8
16
32
64