NEED HELP!!
Suppose a shoe company estimates that its monthly cost is C(x) = 300x ^ 2 + 200x and its monthly revenue is R(x) = - 0.5x ^ 3 + 900x ^ 2 - 500x + 400 , where x is in thousands of pairs of shoes sold. The profit is the difference between the revenue and the cost What is the profit function, P(x) ?