Find two linearly independent vectors perpendicular to the vector $$\vec{v}= \left[\begin{array}{c} 1\cr -7\cr 5 \end{array}\right].$$
$\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$, $\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$