How to generate fourth orthogonal vector

How to find fourth vector knowing previous vectors

Answer 1

[Matt J]

null(A) will give you vectors orthogonal to the rows of A, but to have 4 different and mutually orthogonal vectors requires that you are working in 4D or higher.

Answer 2

[Sonny]

Yes, just find the same way.. thank You:)

[Image Analyst]

This should have been a comment to Matt's answer. Since the answer you found on your own is the same as Matt's, go ahead an officially "Accept" his answer. Thanks.