Homogenous diff. equation and exponential matrix

[Mathman23]

Homework Statement

Howdy,

Given a matrix \left[\begin{array}{ccc}x_{11} & x_{12}\\x_{21} & x_{12}\end{array}\right]

Which has the exponential matrix e^{t\cdot a}

When given the eqn x'= Ax + b where b = \left[\begin{array}{c}b_1 \\ b_2\end{array}\right]

I know that had it only been x' = Ax, then solution would be x = e^{ta} \cdot C where C is a constant.

Could someone here please be so kind to assist me in which secret formula do I use to expres the solution of the system x' = Ax+b??

Cheers
Fred

 

[Dick]

It's actually pretty well explained here. http://en.wikipedia.org/wiki/Matrix_exponential#Applications
There are examples and everything.