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- Apr 10th 2009, 04:36 PM #1

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- Mar 2009
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## Need some help please

I've got a question I'm really not sure how to do. here it is:

Consider the following difference equation:

q(n) = 2*q(n-1) + q(n-2) - 2*q(n-3)

Let q(n) = ar^n. Show that r must satisfy (r-1)(r+1)(r-2) = 0

It doesnt look to hard, im just not quiet sure exactly how to go about it...

- Apr 10th 2009, 05:11 PM #2

- Apr 12th 2009, 07:50 PM #3

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- Mar 2009
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- 11