25. Find the spectral radius of B, where B = D^-1(D_A - A), where A is as defined in Prob. 23, and where

$$

D_A =

\begin{bmatrix}

3 & 0 & 0 \\

0 & 4 & 0 \\

0 & 0 & 4

\end{bmatrix}

D =

\begin{bmatrix}

3 & 0 & 0 \\

0 & 5 & 0 \\

0 & 0 & 4

\end{bmatrix}

$$

This illustrates (2) of Theorem 11.4.6.