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**angler****Guest**

I have this question on my test preparation sheet. It seems simple but is quite unlike anything I have seen before. Could someone please help me. I don't even know where to start:

Find all unit vectors in the plane determined by u=(3,0,1) and v=(1,-1,1) that are perpendicular to the vector w=(1,2,0).

My friend thought you have to use the cross product of vectors at some point.

Much Appreciated

**luca-deltodesco****Member**- Registered: 2006-05-05
- Posts: 1,470

what do you mean determined by u and v? i dont get that part.

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**angler****Guest**

So sorry, the smiley default got into the way...

Find all unit vectors in the plane determined by u = (3,0,1) and v = (1,-1,1) that are perpendicular to the vector w = (1,2,0).

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