某企业投资100万元引进一条产品加工生产线，若不计维修、保养

更新 2022-09-03
科目数学
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某企业投资100万元引进一条产品加工生产线，若不计维修、保养费用，预计投产后每年可创利33万.该生产线投产后，从第1年到第x年的维修、保养费用累计为y(万元)，且y=ax²+bx，若第1年的维修、保养费用为2万元，第2年为4万元。
求y的解析式；
投产后，这个企业在第几年就能收回投资？

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