Find Xn
X(n+2) - 5X(n+1) +6Xn = 2*3^n
please help
This is a difference equation with constant coefficients. Your class notes should tell you what to do.
Find the solution to $\displaystyle X_{n+2} - 5 X_{n+1} + 6 X_n = 0$.
Construct a particular solution.
Now add those two solutions together.
If you need more help please show what you've done and say where you get stuck.