P. 238, lines -3 and -3

The last equation on the page should be:

$\xi (t)=c_1\left[\begin{array}{c}1\\ 1\end{array}\right]e^{3t}+c_2\left[\begin{array}{c}1\\ 0\end{array}\right]e^{2t}+\left[\begin{array}{c}-\frac{1}{50}\\ -\frac{3}{25}\end{array}\right]\cos 4t+\left[\begin{array}{c}-\frac{1}{25}\\ \frac{4}{25}\end{array}\right]\sin 4t$

and the third to last equation on the page should be:

${\xi }_p(t)=\left[\begin{array}{c}-\frac{1}{50}\\ -\frac{3}{25}\end{array}\right]\cos 4t+\left[\begin{array}{c}-\frac{1}{25}\\ \frac{4}{25}\end{array}\right]\sin 4t.$

Return to errata.