Posted by Anonymous on Saturday, July 27, 2013 at 11:06am.
Solve for x if the vectors (2, x, 7x) and (x, 3, 2) are orthogonal

linear algebra  Reiny, Saturday, July 27, 2013 at 2:13pm
if orthogonal, then their dot product is zero
(2,x,7x) . (x , 3, 2) = 0
2x + 3x  14 + 2x = 0
7x = 14
x = 2
check:
(2,2,5).(2,3,2) = 4 + 6  10 = 0
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