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Math Help - scalar triple product, check.

  1. #1
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    Question scalar triple product, check.

    Could someone please check the answer for this.

    Given these vectors
    <br />
\begin{array}{l}<br />
 \vec u = 2\hat i - \hat j + \hat k \\ <br />
 \vec v = 3\hat i + \hat j - 2\hat k \\ <br />
 \vec w = 3\hat i + 2\hat j \\ <br />
 \end{array}<br />

    Find \vec u \bullet (\vec v \times \vec w)

    When I calculate this I get 17 however the answer in the text is given as being 14.
    Could someone confirm the answer please?
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  2. #2
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    Quote Originally Posted by Craka View Post
    Could someone please check the answer for this.

    Given these vectors
    <br />
\begin{array}{l}<br />
\vec u = 2\hat i - \hat j + \hat k \\ <br />
\vec v = 3\hat i + \hat j - 2\hat k \\ <br />
\vec w = 3\hat i + 2\hat j \\ <br />
\end{array}<br />

    Find \vec u \bullet (\vec v \times \vec w)

    When I calculate this I get 17 however the answer in the text is given as being 14.
    Could someone confirm the answer please?
    I get 17 too. Perhaps we're both making the same mistake .....
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  3. #3
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    Cheers. Glad to know I don't make mistakes all the time
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