Question about math (June 2011 Int. SAT)

<p>Anyone remember the exact question for the one with the f(x) and g(x)? It said that g(x) = f(x+1) + f(x-1) and asked to find g(certain value it gave)... what was the equation for f(x)...anyone remember?</p>

<p>I solved this by moving f(x) to the left one unit then to the right one unit which resulted in g(x) being the same graph as f(x). After I have read some posts though, I am really uncertain about this method...I am thinnking that I should have added the two different values of f(x+1) and f(x-1) separately then added them together.....did anyone try both methods? if so, did you get the same answer??</p>