2^n+1*3^n-1 2^n+1 *3^n-1 2^n+1*3^n-1
=___________=____________=_____________=3^(n-1-n+2)=3
2³ * (2*3)^n-2 2³*2^n-2 *3^n-2 2^n+1*3^n-2
(6²)^k+2 6^2k+4 3^2k+4*2^2k+4
=____________=_______________=_______________=2^6=64
3^2k+4*(2²)^k-1 3^2k+4 *2^2k-2 3^2k+4 *2^2k-2