# scalar triple product, check.

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• Sep 30th 2008, 11:53 PM
Craka
scalar triple product, check.
Could someone please check the answer for this.

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

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?
• Oct 1st 2008, 12:32 AM
mr fantastic
Quote:

Originally Posted by Craka
Could someone please check the answer for this.

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

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 ..... (Rofl)
• Oct 1st 2008, 01:02 AM
Craka
Cheers. Glad to know I don't make mistakes all the time