if x and n are positive integers....

I'm stumped on this.. I don't remember this stuff and I need help. Not even sure it is in the right forum, but my Trig teacher gave us this on a worksheet so I tried my luck..

(Moderator - looked for a mod or admin online but none on to ask where to post this - please move to correct forum for me, if not in correct one.. thanks) (Hi)

If *x* and *n* are positive integers with *x > n* and *Xⁿ - Xⁿ⁻¹ - Xⁿ⁻² *= 2009, find *x + n.*

Choices:

A - 10

B - 11

C - 12

D - 13

E - 14

If anyone is able to answer this, can you explain how you got your answer so I can see what I should be doing here? I really appreciate it. Thanks..

Ang

(Angel)