如图,点M(4,0),以点M为圆心、2为半径的圆与x轴交于点A、B。已知抛物线y= x 2 +bx+c过点A和B,与y轴交于点C。 (1)求点C的坐标; (2)点Q(8,m)在抛物线y= x 2 +bx+c上,点P为此抛物线对称轴上一个动点,求PQ+PB的最小值; (3)CE是过点C的⊙M的切线,点E是切点,求OE所在直线的解析式。
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