Can someone please explain this problem

Question

Find the general solution to the linear system of differential equations.

x'1

x'2
x'3
=

−4 −4 5

0 −4 4
0 4 2

x1

x2
x3

Answer 1

^ that should make sense . its a 3X3 matrix multiplied by a 3X1 matrix of x1,x2,x3