3.如圖,二次函數(shù)y=x
2+bx+c的圖象交x軸于點(diǎn)A,B,交y軸于點(diǎn)C,點(diǎn)B的坐標(biāo)為(1,0),對(duì)稱軸是直線x=-1,點(diǎn)P是x軸上一動(dòng)點(diǎn),PM⊥x軸,交直線AC于點(diǎn)M,交拋物線于點(diǎn)N.
(1)求這個(gè)二次函數(shù)的解析式.
(2)若點(diǎn)P在線段AO上運(yùn)動(dòng)(點(diǎn)P與點(diǎn)A、點(diǎn)O不重合),求四邊形ABCN面積的最大值,并求出此時(shí)點(diǎn)P的坐標(biāo).