A sock company estimates that its monthly cost is C(x)=100x^(2)+500x and its monthly revenue is R(x)=-0.5x^(3)+800x^(2)-700x+500, where

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A sock company estimates that its monthly cost is C(x)=100x^(2)+500x and its monthly revenue is R(x)=-0.5x^(3)+800x^(2)-700x+500, where x is in thousands of pairs of socks sold. The profit is the difference between the revenue and the cost. What is the profit function, P(x) ?