How do you write an nth term rule for r=8 and a_1=-2?

1 Answer
Jim G.
Aug 15, 2016

a_n=(-2)(8)^(n-1)

Explanation:

This is a color(blue)"geometric sequence"

with 1st term a_1=-2" and common ratio " r=8

The color(blue)"nth term formula" is found using.

color(orange)"Reminder " color(red)(|bar(ul(color(white)(a/a)color(black)(a_n=ar^(n-1))color(white)(a/a)|)))
where a is the first term and r, the common ratio.

here a = -2 and r = 8

rArra_n=(-2)xx(8)^(n-1)

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