# Impulse Response In A Discrete System

Hey guys, this is my first post and I'm looking for a bit of help

This is going to sound really easy (and I know it is) but I can't for the life of me remember how to work out the Impulse Response Function of this system. I've tried google for a few hours but nowhere that gives it in laymans terms.

What I would like to know is what the impulse response function h(n) is of System A

y(n) =$$\frac{x(n) - 2x(n-1) + x(n-2)}{2}$$

Any assistance would be great, It doesn't even need to be the answer just how I can work it out.

Thanks

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An impulse is 1 for n = 0 and 0 for any other n.