A First Course in Linear Algebra · Problem FS-RQ1

Vector Spaces — Robert Beezer

Mathematics — Linear Algebra · extended-echelon-form-column-space

Problem

Find a nontrivial element of the left null space of

A

A = \begin{bmatrix} 2 & 1 & -3 & 4 \\ -1 & -1 & 2 & -1 \\ 0 & -1 & 1 & 2 \end{bmatrix}