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## Homework Statement

What is the null space of this matrices.

|1 1 0 3 1|

|0 1 -1 0 1|

|1 1 3 0 1|

## The Attempt at a Solution

I reduced it to rref using agumented matrice(each one equals to zero )

|1 0 0 4 0 0|

|0 1 0 -1 1 0|

|0 0 1 -1 0 0|

and i get get x1=-x4 , x2= x4 + -x5, x3 = x4

but then what is the null space??