Chapter 6.4, Problem 15P

For each of the matrices in problem $15$ through $18$ use a computer to assist in finding a fundamental set of real solutions to the system $\text{x'=Ax}$.

$\text{A=}\left(\begin{array}{cccc}-3& 6& 2& -2\\ 2& -3& -6& 2\\ -4& 8& 3& -4\\ 2& -2& -6& 1\end{array}\right)$