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大家都知道,可以用一元二次方程根的判别式来判别方程根的状况,判别二次函数图像与x轴交点情况.除此之外,用判别式求二次函数的最大(小)值也是很方便的.下面举例说明如何应用判别式求二次函数的最大(小)值.
As you all know, you can use the discriminant of the root of a quadratic equation to discriminate the status of the equation root and discriminate the intersection of the quadratic function image and the x-axis. In addition, use the discriminant to find the maximum (small) value of the quadratic function. It is also very convenient. Here is an example of how to use the discriminant to find the maximum (small) value of a quadratic function.