Posted by **Maths** on Tuesday, August 20, 2013 at 1:48pm.

Is given a function:

f(x)=x2 + px + q

Prove that:

f(x+1) + f(x-1)= 2+2 f(x)

- Maths -
**Steve**, Tuesday, August 20, 2013 at 2:40pm
just plug in the values:

f(x+1) = (x+1)^2 + p(x+1) + q

f(x-1) = (x-1)^2 + p(x-1) + q

add them to get

2x^2 + 2 + 2px + 2q

2(x^2+px+q) + 2

2f(x) + 2

- Maths -
**plsHelp**, Tuesday, August 20, 2013 at 4:37pm
Steve thanks very much, may i have your email id so i can ask a question with integrals/limits which i cant write here

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