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Math Help - Vectors in space

  1. #1
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    Vectors in space



    I understand the first 2 steps, but not the last.
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  2. #2
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    note that \overrightarrow{OA} + \overrightarrow{OB} = \overrightarrow{OP'}
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  3. #3
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    Quote Originally Posted by skeeter View Post
    note that \overrightarrow{OA} + \overrightarrow{OB} = \overrightarrow{OP'}
    Why do you have to do that kind of a transformation? Why can't I leave it at the second step?
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  4. #4
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    I don't think it was a step ... all three vector equations yield the same result.

    I guess it's the "Kumon" way of showing you that there's more than one road to get to Dallas.

    note that the last expression should be ...

    \overrightarrow{OA} + \overrightarrow{OB} + \overrightarrow{P'P}
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  5. #5
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    Quote Originally Posted by skeeter View Post
    note that the last expression should be ...

    \overrightarrow{OA} + \overrightarrow{OB} + \overrightarrow{P'P}
    Well, the solution book says \overrightarrow {OC}.

    Anyway, \overrightarrow {OC}=\overrightarrow {P'P}
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