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XiaoHuang
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「数学」二次函数中项系数大小与图像的关系
Posted: Mar 23, 2020
Last Modified: Mar 30, 2020
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内容

当$a>0$时,二次函数图像开口向上;

当$a<0$时,二次函数图像开口向下。

$|a|$越大,则二次函数图像的开口越小;

$|a|$越小,则二次函数图像的开口越大。

开口向上,对称轴在$y$轴左边,$b>0$;

开口向上,对称轴在$y$轴右边,$b<0$;

开口向下,对称轴在$y$轴左边,$b<0$;

开口向下,对称轴在$y$轴右边,$b>0$。

和$y$轴交点在原点上方,$c>0$;

和$y$轴交点在原点下方,$c<0$。

Article License: CC BY-NC-ND 4.0
Article Author: XiaoHuang
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