已知二次函数f(x)=ax²+bx+c的图像与x轴有两个交点,两交点间的距离为6,图像的对称轴为直线x=2,且f(x)有最小值为-9,试求(1)a,b,c的值.(2)如果f(x)不大于7,求此时x的取值范围.不好意思哈还
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![已知二次函数f(x)=ax²+bx+c的图像与x轴有两个交点,两交点间的距离为6,图像的对称轴为直线x=2,且f(x)有最小值为-9,试求(1)a,b,c的值.(2)如果f(x)不大于7,求此时x的取值范围.不好意思哈还](/uploads/image/z/6966256-40-6.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%28x%29%3Dax%26sup2%3B%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%2C%E4%B8%A4%E4%BA%A4%E7%82%B9%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA6%2C%E5%9B%BE%E5%83%8F%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BA%E7%9B%B4%E7%BA%BFx%3D2%2C%E4%B8%94f%28x%29%E6%9C%89%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BA-9%2C%E8%AF%95%E6%B1%82%EF%BC%881%EF%BC%89a%2Cb%2Cc%E7%9A%84%E5%80%BC.%EF%BC%882%EF%BC%89%E5%A6%82%E6%9E%9Cf%EF%BC%88x%29%E4%B8%8D%E5%A4%A7%E4%BA%8E7%2C%E6%B1%82%E6%AD%A4%E6%97%B6x%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D%E5%93%88%E8%BF%98)
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