Change these 2 vectors into an orthonormal set

x1 =
1
1
1
1

and x2 =
1
-1
1
-1

Question: How can we change the set {x1,x2} into an orthonormal set? Demonstrate.

Any help would be great!! Thanks :)

Since the vectors are already orthoganal, all you do is 'normalize them. Ie divided each vector by its norm. For example, if x=(1,1,1,1) (transpose...), then the new vector is (1/||x||)x=(1/√(4))x=(1/2)x= (1/2,1/2,1/2,1/2).
You do the other one.