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我们把使函数y=f(x)的值为0的实数x称为函数y=f(x)的零点.由此可以看出,函数y=f(x)的零点,就是方程f(x)=0的实数根.从图像上看,函数y=f(x)的零点,也是它的图像与x轴交点的横坐标.
We call the real number x that makes the function y = f (x) 0 as the zero of the function y = f (x), and we can see that the zero point of the function y = f ) = 0 The real number root of 0. From the image point of view, the zero of the function y = f (x) is also the abscissa of the intersection of its image with the x axis.