This problem is quite troublesome, it is the finale of quadratic function, and it is very difficult. The second question needs to be discussed in categories to avoid missing solutions. In the process of calculation, there are unknowns in the analytical formula, which increases the difficulty of calculation. Please look at the answers/exercises/math /7983 10. I hope you can adopt it. No, please ask me again. I'm glad to answer it for you.

Parabola y=(k/8)(x+2)(x-4)(k is constant and k >；; 0) From left to right, it intersects with X axis at points A and B, and intersects with X axis at point C. The straight line passing through point B is y=- root sign for three times, and the other intersection of x/3+b and parabola is d. 。

(2) If there is a point P on the parabola of the first quadrant, make the triangle with vertices A, B and P similar to triangle ABC, and find the value of k;

(3) Under the condition of (1), let f be a point on the straight line BD (excluding the end point) and connect AF. The moving point M starts from point A, moves along the line AF to F at a speed of 1 unit per second, and then moves along the line FD to point D at a speed of 2 units per second. What are the coordinates of point F?