Find a basis for the null space of matrix A.
A = $\left[\begin{array}{ccc} 6 &4 &0\cr 1 &2 &1 \end{array}\right]$
Basis is $\Bigg \lbrace$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$ $\Bigg \rbrace$