1.如圖(1),拋物線y=ax
2+6x+c交x軸于A,B兩點(diǎn),交y軸于點(diǎn)C.直線y=x+5經(jīng)過點(diǎn)A,C.
(1)求拋物線的解析式;
(2)如圖(2),若過點(diǎn)B的直線交直線AC于點(diǎn)M.
①當(dāng)BM⊥AC時(shí),過拋物線上一動(dòng)點(diǎn)P(不與點(diǎn)B,C重合),作直線BM的平行線交AC于點(diǎn)Q,若以點(diǎn)B,M,Q,P為頂點(diǎn)的四邊形是平行四邊形,求點(diǎn)P的橫坐標(biāo);
②連接BC,當(dāng)直線BM與直線AC的夾角等于∠ACB的2倍時(shí),請(qǐng)直接寫出點(diǎn)M的坐標(biāo).