Hi all!

Can someone help me with this exercise? I don't know how to start

Calculate the equation in finite differences of:

14x[n]-9x[n-1]+x[n-2]=70delta[n+3]-10delta[n+2]

Thanks in advance

Greetings

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- May 12th 2009, 09:45 AMAngusEquation in finite differences
Hi all!

Can someone help me with this exercise? I don't know how to start

Calculate the equation in finite differences of:

14x[n]-9x[n-1]+x[n-2]=70delta[n+3]-10delta[n+2]

Thanks in advance

Greetings - May 22nd 2009, 09:35 AMMedia_ManSimple Substitution
First, realize that by definition. So, substitute:

The way recursive formulas are defined is by relating to a formula involving several values for , so we want to isolate the x with the highest subscript, in this case, .

More formally,

for all

Therefore, to actually find the terms in this sequence, we would need to know the first six values of the sequence.