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一、结论的发现在画二次函数的的图象时,我们通常先列表,在表中对自变量x的值以间隔相等的值取之,求出y的值．例如:1．画函数．y=x2-2x-3的图象时列表如下:
First, the discovery of the conclusion When drawing the image of the quadratic function, we usually list first, and take the value of the independent variable x in the table as the value of the value of y. For example: 1. Draw function. The list of images of y=x2-2x-3 is as follows: