Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7

Question

Find an explicit rule for the nth term of the sequence. 7, -7, 7, -7

is it an = 7 • (-1)^n-1

^

Answer 1

it's a geometric series with common ratio, r, = -1

nth term is a1(r^(n-1)

= 7(-1)^(n-1)

You're right.