请问一下判别式法求函数值域的原理/本质到底是什么OO希望用通俗的语言解释一下~谢谢

问题：请问一下判别式法求函数值域的原理/本质到底是什么OO希望用通俗的语言解释一下~谢谢

答案：↓↓↓

韩江义的回答：

网友采纳　　就是判别式大于零图像就与X轴有交点········································································································