(adsbygoogle = window.adsbygoogle || []).push({}); Proving - numerical analysis (separation of symbols)

How do I prove this?

f(x+n) = f(x+n-1) + /\f(x+n-2) + ... + /\^(n-2) f(x+1) + /\^(n-1) f(x) +

/\^n f(x-1)

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# Which is correct?

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