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Homework Statement
Determine a vector that is orthogonal to both (1,2,-1) and (3,1,0)
Homework Equations
As above.
The Attempt at a Solution
The solution, from the back of the book, is "any vector of the form (a, -3a, -5a), but I'm not sure how they got there. I get the methodology for a matrix in two dimensions, like so:
Find a matrix orthogonal to (5,1)
(5a) + (-b) = 0
5a = b
The answer is (a, 5a) or any vector of the form a(1,3)
...but I don't understand how to go about this for the question originally stated.