Need help Digital signals. Energy and power

[cleopatra]

Need help! Digital signals. Energy and power

Homework Statement

∞
∑ (3)^2n
n=0

FInd the energy of the signal
Find the power of the signal

The Attempt at a Solution

Energy: (3)2n = 32+34+36+...=9+81+...= ∞
N
Power: lim (1/(2N+1)) * ∑ |x(n)^2 |
N→∞ N=-n

 

[cleopatra]

N→∞ N=-n and N are supposed to be below and on top of the "sum"