Question

Am I right?
What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of −12?

an = 4(−3)n − 1; all integers where n ≥ 1<---
an = 4(−3)n − 1; all integers where n ≥ 0
an = 4(36)n − 1; all integers where n ≥ 1
an = 4(36)n − 1; all integers where n ≥ 0

Answer 1

@AverageJoe20 @ganeshie8 @JoannaBlackwelder @Lady.Liv1776 @narissa @Michele_Laino @TuringTest @thomaster @triciaal @Ineedhelpfast12

Answer 2

Correct.
first term = 4
common ratio = -12/4 = -3

therefore the general term is given by
\[a_n=4(-3)^{n-1}~;~n\ge 1\]

Answer 3

Can you check a few more sire?