0004.ptx

<exercise checkit-seed="0004" checkit-slug="G3" checkit-title="Eigenvalues">
  <statement>
    <p>Explain how to find the eigenvalues of the matrix <m> \left[\begin{array}{cc}
7 &amp; 1 \\
-18 &amp; -4
\end{array}\right] </m>.</p>
  </statement>
  <answer>
    <p>The characteristic polynomial of <m> \left[\begin{array}{cc}
7 &amp; 1 \\
-18 &amp; -4
\end{array}\right] </m> is <m> \lambda^{2} - 3 \lambda - 10 </m>.</p>
    <p>The eigenvalues of <m> \left[\begin{array}{cc}
7 &amp; 1 \\
-18 &amp; -4
\end{array}\right] </m> are <m> 5 </m> and <m> -2 </m>.</p>
  </answer>
</exercise>