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Math Help - Vectors problem

  1. #1
    Junior Member
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    Vectors problem

    Point C has position vec (2 , 3) and point D has position vec (1 , 2)
    find position vec of the point which divides CD in the ratio 4:-3
    I really don't understand the ratio part of this question.
    I know that minus sign indicates that it divides externally
    so i took the point as P which divides externally

    Than i soldes
    OP>=OC> + CP>
    i know that CP> is 3/4th of CD>
    so 2i + 3j + 3/4(-i-2j + 2i +3j)
    Solving this i get the wrong answer.
    Can someone explain?A diagram would be much appreciated.
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  2. #2
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    Hello kandyfloss
    Quote Originally Posted by kandyfloss View Post
    Point C has position vec (2 , 3) and point D has position vec (1 , 2)
    find position vec of the point which divides CD in the ratio 4:-3
    I really don't understand the ratio part of this question.
    I know that minus sign indicates that it divides externally
    so i took the point as P which divides externally

    Than i soldes
    OP>=OC> + CP>
    i know that CP> is 3/4th of CD>
    so 2i + 3j + 3/4(-i-2j + 2i +3j)
    Solving this i get the wrong answer.
    Can someone explain?A diagram would be much appreciated.
    This is the same question that you asked here, to which I gave an answer that you said made things clear. What is the problem now?

    Grandad
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  3. #3
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    My sincere apologies..i tried looking for that thread but couldnt find. It thank u
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