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大家知道,对于二次函数y=a(x-h)2+k(a≠0)(其中h为函数图像顶点的横坐标,k为顶点的纵坐标)来说,当a>0时,顶点(h,k)为图像的最低点
As you know, for the quadratic function y=a(xh)2+k(a≠0) (where h is the abscissa of the vertex of the function image and k is the ordinate of the vertex), when a>0, the vertex ( h,k) is the lowest point of the image