A simple mathematical problem of quadratic function At the beginning, a businessman sold a certain commodity with a purchase price of 8 yuan per piece at 10 yuan per piece, and he could sell 100 pieces per day. He wanted to increase the price to increase the profit. Through the experiment, it was found that the daily sales of this commodity would decrease by 10 pieces per piece with a price increase of 1 yuan. Please write down the functional relationship between the price x (yuan / piece) and the daily profit y (yuan)
y=(x-8)[100-10(x-10)]=(x-8)(200-10x)
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