0011.ptx

<exercise checkit-seed="0011" checkit-slug="G4" checkit-title="Eigenvectors">
  <statement>
    <p>Explain how to find a basis for the eigenspace associated to the eigenvalue <m> 1 </m> in the matrix <me> \left[\begin{array}{cccc}
2 &amp; 2 &amp; 1 &amp; -3 \\
0 &amp; 2 &amp; 1 &amp; -1 \\
-5 &amp; 3 &amp; 9 &amp; 2 \\
-5 &amp; 1 &amp; 6 &amp; 5
\end{array}\right] </me></p>
  </statement>
  <answer>
    <p>
      <me>\operatorname{RREF} \left[\begin{array}{cccc}
1 &amp; 2 &amp; 1 &amp; -3 \\
0 &amp; 1 &amp; 1 &amp; -1 \\
-5 &amp; 3 &amp; 8 &amp; 2 \\
-5 &amp; 1 &amp; 6 &amp; 4
\end{array}\right] = \left[\begin{array}{cccc}
1 &amp; 0 &amp; -1 &amp; -1 \\
0 &amp; 1 &amp; 1 &amp; -1 \\
0 &amp; 0 &amp; 0 &amp; 0 \\
0 &amp; 0 &amp; 0 &amp; 0
\end{array}\right] </me>
    </p>
    <p>A basis of the eigenspace is <m> \left\{ \left[\begin{array}{c}
1 \\
-1 \\
1 \\
0
\end{array}\right] , \left[\begin{array}{c}
1 \\
1 \\
0 \\
1
\end{array}\right] \right\} </m>.</p>
  </answer>
</exercise>