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二次函数y=ax~2+bx+c(a≠0)的顶点坐标是(-b/2a,y=4ac-b~2/4a;当a>0,x=-b/2a,二次函数有最值y= 例1 宏达汽车租赁公司共有出租车120辆,每辆汽车的日租金为160元,出租业务天天供不应求。为适应市场需求,经有关部门批准,公司准备适当提高日租金。经市场调查发现,一辆汽车的日租金每增加10元,每天出租的汽车会相应减少6辆。若不考虑其他因素,公司将每辆汽车的日租金提高几个10元时,才能使公司的日租金总收入最高?这时,公司的日租金总收入比提高日租金前增加了多少元?
The vertex coordinates of the quadratic function y=ax~2+bx+c(a≠0) are (-b/2a,y=4ac-b~2/4a; when a>0, x=-b/2a, two The subfunction has the most value y = Example 1 There are 120 taxis in Hongda Car Rental Co., with a daily rental of RMB 160 per vehicle, and the rental business is in short supply every day. To meet the market demand, the company is prepared to raise the number of days after the approval of relevant departments. According to market research, the daily rent for a car increases by RMB 10 per day, and the number of cars rented per day will be reduced by 6. If the other factors are not taken into consideration, the company will increase the daily rent of each car by RMB 10 yuan. To make the company’s total daily rental income the highest, at this time, the company’s total daily rental income than before increasing the daily rent increased by how many dollars?