1. The problem statement, all variables and given/known data P is profit in dollars of a particular mp3 player. P = -76x^3 + 4830x^2 - 320000, 0 < x < 60 x is ad expense (in tens of thousands of $.) Find the smaller of two ad amounts that yield a profit of $2,500,000. The attempt at a solution All I can do is get this: -76x^3 + 4830x^2 - 2,820,000 = 0 Now what do I do? I can't seem to factor. The only other way I know of is dividing by possible zeros, and I'm not feeling good about looking for the factors of 2.82 million.