As shown in the figure, in the plane rectangular coordinate system, a is a certain point on the negative half axis of the X axis, and a moving point B starts from the origin and moves along the Y axis at a speed of one unit per second Axis positive half axis forward ABC is isosceles Two seconds later, C (2, - 2) calculates the coordinates of point a

As shown in the figure, in the plane rectangular coordinate system, a is a certain point on the negative half axis of the X axis, and a moving point B starts from the origin and moves along the Y axis at a speed of one unit per second Axis positive half axis forward ABC is isosceles Two seconds later, C (2, - 2) calculates the coordinates of point a

Let a (x, 0) (x, 0) be rounded off
If AB = BC, then x ^ 2 + 4 = 20, we get x = - 4, only take negative value, so a (- 4,0)
If AC = BC, then (X-2) ^ 2 + 4 = 20, then x = - 2, only take negative value, so a (- 2,0)