(1) OH= radical number 2, k= 1, b=2 or k=- 1, b=-2. If A0=BO=2 and AO is perpendicular to BO, then HO= root number 2, then the distance from the origin o to the straight line y=kx+b is root number 2. According to the formula from point to straight line, and the straight line crosses (-2,0), k 2 = 1. K= plus or minus 1, and b=2k. Find k, B.

(2) From the parabola y=a(x+ 1)(x-5), we can know that the parabola must pass through points m (- 1, 0) and n (5 5,0), and d is the midpoint, then d = (2 2,0) Suppose there is a point e, then the point e is on the parabola. Next, you do math.