I cant understand the impulse response in convolution

[Jncik]

Homework Statement

i have this graph

[PLAIN]http://img858.imageshack.us/img858/1346/56954457.png

and i need to find h_-1[k]

i don't understand, i know that the impulse response is the response for input -> δ[n], in this case it will be δ[n+1], but i don't understand how to calulate the response..
my book doesn't say anything it just has the solution which is the following

[PLAIN]http://img96.imageshack.us/img96/7766/61813044.png

can you show me how he figured this out?? you d save my life

 

[I like Serena]

You're leaving out some context, so I'm going to make a few educated guesses.

I suspect we're talking about some signal that is passed through a filter, which would yield an output signal.

In this case the input signal would be modeled with x[n].
The filter would be modeled with h[n].
And you would have an unmentioned output signal that we'll call y[k].

The correlation would then be given by the following equation:

Basically, what I'm trying to say, based on my series of assumptions, is that h[n] is not calculated here, but given, to be used in a later step.

Do any of my assumptions and my tentative conclusion come near the reality?

 

[Jncik]

yes they do, thank you very much, i just wasnt sure that he gave us this to find out the y[n]