If A=(1100)A = \begin{pmatrix} 1 & 1 \\ 0 & 0 \end{pmatrix}A=(1010), what is the null space of AAA?
All vectors x=(x1x2)x = \begin{pmatrix} x_1 \\ x_2 \end{pmatrix}x=(x1x2) such that x1=−x2x_1 = -x_2x1=−x2.
Only the zero vector.
All vectors in R2\mathbb{R}^2R2.
None of the above.