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title: The Vertex of a Parabola
localeTitle: 抛物线的顶点
## 抛物线的顶点
抛物线的顶点是抛物线的最低点或最高点（如果抛物线是颠倒的）。这是斜率从正变为负，反之亦然的点。对于给定的二次y = ax ^ 2 + bx + c，通过计算h = -b / 2a并通过插入h来评估y来找到顶点（h，k）。
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