find a vector u=(a,b,c) where a,b,c are not all 0 so that u is orthogonal to both x=(1,2,1) and y=(1,-1,1)

Can I use the cross product on x and y or would that be incorrect?

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- Feb 8th 2010, 04:38 PMsuperdudefind a vector that has this characteristic
find a vector u=(a,b,c) where a,b,c are not all 0 so that u is orthogonal to both x=(1,2,1) and y=(1,-1,1)

Can I use the cross product on x and y or would that be incorrect? - Feb 8th 2010, 07:41 PMtonio
- Feb 9th 2010, 05:17 AMmath2009
There is another method except cross product.

If dimension is high, cross product is complex