PLEASE HELP! WILL MARK BRAINLIEST!! :D

Given the explicit formula for a geometric sequence, find the first 5 terms and the 8th term. (I already have the answers for the 8th term, I just need help finding the first 5 terms)

aN = 3^8-1 = 2,187
aN = 2 * (1/4)^8-1 = 0.000122
aN = -2.5 * 4^8-1 = -40,960
aN = -4 * 3^8-1 = -8,748