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二次函数顶点怎么求
更新时间： 2020-10-27 00:00:00  

求二次函数顶点，顶点坐标为(-b/2a，(4ac-b^2)/4a)，交点式：y=a(x-x₁)(x-x₂)。仅限于与x轴有交点A（x₁，0）和B（x₂，0）的抛物线。其中x1，2=-b±√b^2－4ac，顶点式：y=a(x-h)^2+k。

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