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在求直线和圆锥曲线的交点时,二次方程根的判别式有着十分重要的作用.根据判别式△的符号,我们可以判定直线和圆锥曲线交点的个数,进而可以判定直线和二次曲线的位置
The discriminant of the quadratic equation root plays an important role in finding the intersection of a straight line and a conic section. Based on the sign of the discriminant △, we can determine the number of intersections between a straight line and a conic section, and then determine the straight line and the quadratic curve. s position