freeCodeCamp/guide/chinese/mathematics/domain-and-range-of-quadrat.../index.md

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---
title: Domain and Range of Quadratic Functions
localeTitle: 二次函数的域和范围
---
## 二次函数的域和范围
域和范围确定任何给定函数内变量的可能值。
在二次函数的情况下域几乎总是x = +/-无穷大x可以等于任何数字。 另一方面范围由抛物线的顶点确定。例如等式y = x ^ 2 + 2的范围是y> 2因为y不能等于顶点以下的任何数字。
### 更多信息: