As shown in the figure, in the plane rectangular coordinate system, △ ABC is an isosceles triangle, a (0,2), B (1,0) if the line y = KX + 2K intersects the X axis at point D,

As shown in the figure, in the plane rectangular coordinate system, △ ABC is an isosceles triangle, a (0,2), B (1,0) if the line y = KX + 2K intersects the X axis at point D,

Three points, D1 = (- 1,0), D2 = (- 1.5,0), D3 = (√ 5 + 1,0) if K is to be found, D1 and point a are to be used simultaneously, D2 and point a are to be used simultaneously, and D3 and point a are to be used simultaneously to find the linear function