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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Originally Posted by superdude 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? Of course you can cross multiply the vectors and that's correct: the cross product is a vector orthogonal to both original ones. Tonio
There is another method except cross product. If dimension is high, cross product is complex
Last edited by math2009; February 9th 2010 at 03:17 PM.
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