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Math Help - Vector..

  1. #1
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    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'
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  2. #2
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    Re: Vector..

    It means you go out further than the end of the original vector...
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  3. #3
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    Re: Vector..

    Quote Originally Posted by Trefoil2727 View Post
    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'
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  4. #4
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    Re: Vector..

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