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## Homework Statement

Let u1 = (2; 1; 1; 1) and u2 = (4; 2; 2;-1).I need to extend the linearly independent set u1 and u2 to obtain a basis of R^4.

## Homework Equations

## The Attempt at a Solution

u1 and u2 are linearly independent since both vectors are non-zero and none is a multiple of the other ,I should probably choose 2 other vector u3 and u4 such that I have a matrix of rank 4,since R^4, and to keep the linearly independece ........but what should I do next?Can someone please explain to me?