Ok, so I've read this

http://www.mathhelpforum.com/math-he...tml#post356455

But I'm still a bit confused.

My question is this: How do I know when to use vs to solve.

Here's an example.

So i take

(skip a few steps)

(some quadratic magic)

*poof*

Ok, so now, how do I know which is my which is my ?

Which one do I use to grind through the rest of this?

Does it matter?

If I solve the matrix for the zero vector using , I wind up with the vector .

With , however, I get .

Given initial conditions, this will effect my result, correct? But it only changes the signs of my constants. Which would be expected since the sign of the equations I end up will will also be opposite?

(sorry if this is a stupid question)