题目

二次函数y=ax2+bx+c的对称轴为x=3,最小值为−2,且过(0,1),求此函数的解析式. 答案:【答案】此二次函数的解析式为:y= (x−3)2−2=x2−2x+1.【解析】试题分析:由题目已知条件可得,二次函数的顶点坐标为(3,-2),所以将二次函数解析式设为顶点式为y= a(x−3)2−2,又因为二次函数经过点(0,1),所以将点(0,1)的坐标代入解析式求出a即可.试题解析:∵二次函数y=ax2+bx+c的对称轴Finding her house broken into, ________.A.a policeman was asked to helpB.the area was searched thoroughlyC.it was looked for everywhereD.she hurried to a policeman for help
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