Chapter 6, Matrices and Determinants - Section 6.2 - The Algebra of Matrices - 6.2 Exercises - Page 512: 42

$A^2=\left[\begin{array}{c c} -0.6 & 0.94&-0.04\\ -0.1 & 1.12& 1.92\\0.41&-0.95&-1.31\end{array} \right]$

Using a graphing calculator (see attached picture), we get: $A^2=\left[\begin{array}{c c} -0.6 & 0.94&-0.04\\ -0.1 & 1.12& 1.92\\0.41&-0.95&-1.31\end{array} \right]$