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Math Help - Perpendicular Vector Resolute

  1. #1
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    Perpendicular Vector Resolute

    PLEASE HELP



    Me and my friends keep getting 1/9(13i - 20j - 23k) for this question and can't work out why the sign is incorrect, I am investigating whether or not it is a typo but am wondering what you guys think the answer is?

    Also sorry if this is the wrong board, I wasn't sure if it was algebra or geometry...
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  2. #2
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    Re: Perpendicular Vector Resolute

    I make it to be E
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  3. #3
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    Re: Perpendicular Vector Resolute

    Working out please?
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  4. #4
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    Re: Perpendicular Vector Resolute

    Let the first vector be a and the second one b. Make a unit vector in the direction of b. Work out the scalar product of this unit vector with a. This then is the magnitude of the resolute in the direction of b so you can work out the vector for this resolute. Then do the vector subtraction of this from a to get the required vector.
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