Writeanequationtodescribethesequencebelow.Usentorepresentthepositionofaterminthesequence,wheren = 1forthefirstterm.
1 , –2 , 4 , ...
The equation to describe the sequence is:
a_n = (-1)^(n+1) * 2^(n-1)
where n is the position of a term in the sequence.