# Homework Help: Cross and dot product problem

1. Nov 6, 2006

### prace

Ok, this one has really got me...

Suppose that u $$\centerdot$$ (vXw) = 2.

Find

(a) (uXv) $$\centerdot$$ w
(b) u$$\centerdot$$(wXv)
(c) v$$\centerdot$$(uXw)
(d) (uXv)$$\centerdot$$v

Once I understand the what to do with the information given, I am sure the rest of the problems will fall into place, but can anyone help me to get started with this? Thanks

Oh, and just for clarification, the little dots that are out of place there are suppossed to represent the dot product. I used the \centerdot command with LaTeX but for some reason it is not where it should be. I am still pretty new at it. If I figure it out, I will edit the post again. So, for example, (a) is (u cross v) dot w.

Last edited: Nov 6, 2006
2. Nov 6, 2006

### 0rthodontist

Last edited: Nov 6, 2006
3. Nov 6, 2006

### dextercioby

Try the "\cdot" command. Also "\times".

Daniel.

4. Nov 6, 2006

### prace

Thanks for the link Orthodontist!

Let's give this a try... (u$$\cdot$$v)$$\times$$w

oop... hmm, still too high...

5. Nov 6, 2006

### dextercioby

You have to write everything in tex in order to make things right.

$$\left(\mathbf{u}\cdot\mathbf{v}\right)\times\mathbf{w}$$

Daniel.

Last edited: Nov 6, 2006