1. ## Vector..

It is given that OA=a and OB=b. Find OR in each of the following cases:
a) R is a point on the straight line AB such that AR : RB=1:2
b) R lies on the extended straight line AB such that AR:RB= 4:3
c) R is the midpoint of the straight line AB
I solved (a), but I don't know what is the mean of 'extended straight line'

2. ## Re: Vector..

It means you go out further than the end of the original vector...

3. ## Re: Vector..

Originally Posted by Trefoil2727
It is given that OA=a and OB=b. Find OR in each of the following cases:
a) R is a point on the straight line AB such that AR : RB=1:2
So the distancde from B to R is twice the distance from A to R. And that means that the distance from A to R is 1/3 the distance from A to B.

b) R lies on the extended straight line AB such that AR:RB= 4:3
So the distance from A to R is 4/3 the distance from B to R. And that means that the distance from A to B is 4/(4+3)= 4/7b thwe distance from A to R.

c) R is the midpoint of the straight line AB
I solved (a), but I don't know what is the mean of 'extended straight line'

4. ## Re: Vector..

still don't understand..how to find OR?