已知:抛物线Y=ax²+bx+c(a≠0)的对称轴为X=-1,与X轴交于A.B两点,与Y轴交于点c,其中A(-3,0)C(0,-2)(1)求这条抛物线的函数表达式(2)已知对称轴上存在一点P,使得PB+PC最小.请求出点P的坐标
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![已知:抛物线Y=ax²+bx+c(a≠0)的对称轴为X=-1,与X轴交于A.B两点,与Y轴交于点c,其中A(-3,0)C(0,-2)(1)求这条抛物线的函数表达式(2)已知对称轴上存在一点P,使得PB+PC最小.请求出点P的坐标](/uploads/image/z/3816051-51-1.jpg?t=%E5%B7%B2%E7%9F%A5%3A%E6%8A%9B%E7%89%A9%E7%BA%BFY%3Dax%26sup2%3B%2Bbx%2Bc%28a%E2%89%A00%29%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BAX%3D-1%2C%E4%B8%8EX%E8%BD%B4%E4%BA%A4%E4%BA%8EA.B%E4%B8%A4%E7%82%B9%2C%E4%B8%8EY%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9c%2C%E5%85%B6%E4%B8%ADA%EF%BC%88-3%2C0%EF%BC%89C%EF%BC%880%2C-2%EF%BC%89%EF%BC%881%EF%BC%89%E6%B1%82%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%87%BD%E6%95%B0%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8A%E5%AD%98%E5%9C%A8%E4%B8%80%E7%82%B9P%2C%E4%BD%BF%E5%BE%97PB%2BPC%E6%9C%80%E5%B0%8F.%E8%AF%B7%E6%B1%82%E5%87%BA%E7%82%B9P%E7%9A%84%E5%9D%90%E6%A0%87)
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