Im stuck on the following question
Find the value of for which (1, A, 3) and (A, 2, 1) are orthogonal. Using that
value of A, find a third vector orthogonal to both of them.
iv done the cross product on them and got the following result (A+6)i - (1-3A)j + (-2- )k but cant see anyway to actually determine A.
Thanks for any help