Posted by Anonymous on Saturday, March 29, 2008 at 12:19pm.
Use the cross product to find a vector perpendicular to each of the following pairs of vectors.
(2, 1, 3) and (1, 4, 2)
Can someone please explain this step by step?

Math  drwls, Saturday, March 29, 2008 at 1:32pm
The cross product is the vector that one can calculate with this determinant:
 i j k 
 21 3 
 1 42 
= (212) i + (3+4)j + (8+1) k
= 10i +7j +9k
or (10, 7, 9) in your notation.
That vector, or any vector that is a scalar multiple of it, will be perpendicular to the other two vectors.
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