HW4 Prob 3a formula correction

The formula given in problem 3a is incorrect. It should be be replaced with:

$y_{k}=CA^{k}x_{0}+\sum _{i=0}^{k-1}CA^{i}Bu_{k-1-i}+Du_{k}$

--Braman 08:19, 23 October 2007 (PDT)