Current location - Training Enrollment Network - Mathematics courses - Who can give an analysis of 06 Shandong Mathematics College Entrance Examination Science 14?
Who can give an analysis of 06 Shandong Mathematics College Entrance Examination Science 14?
Let the straight line passing through point (4,0) be x=ky+4, and substitute it with Y 2 = 4x to get: Y 2-4ky- 16 = 0, so there is: y 1+y2=4k.

Y 1*y2=- 16, required y12+y2 2 = (y1+y2) 2-2y1y2 =16k 2+.