Consider the closed-loop second-order system
$$
\begin{aligned}
& \dot{\mathbf{x}}=\left[\begin{array}{rr}
0 & 3 \\
-5 & -K
\end{array}\right] \mathbf{x}+\left[\begin{array}{l}
0 \\
1
\end{array}\right] r \\
& y=\left[\begin{array}{ll}
2 & 0
\end{array}\right] \mathbf{x}+[0] u .
\end{aligned}
$$
Compute the sensitivity of the closed-loop system to variations in the parameter $K$.