Hi, having a little trouble on this vector question, any help appreciated!
Hello, LHS!
Here's an "eyeball" solution . . .
The position vectors of points and relative to an origin
. . are: . .
Find the position vector of the point which lines on produced
. . such that: . .
. .
Going from to , we see:
. .
Going from to , the change would be the same:
. .
Threfore: .