Question

Find an equation for the nth term of the sequence.

-1, -4, -16, -64, ...

Answer 1

This is a geometric series whose common ratio is 4.

Answer 2

Use the formula for the n th term of a geometric series, and plug in r = 4, since the ratio is 4.

Answer 3

the first term, -1, is a, in the formula.

Answer 4

Now, you just have to plug into the formula and you'll be finished.

Answer 5

Would this be the correct answer: an = 4 • -1n

Answer 6

the n th term is a(r^(n-1))

Answer 7

an = -1 • 4n - 1?

Answer 8

(-1)(4^(n-1))

Answer 9

You have 4n - 1, thats wrong. It is 4^(n-1).

Answer 10

that is what I put an = -1 • 4n - 1, I just did not do this 4^n-1

Answer 11

You have 4n - 1, thats not correct. I wrote 4^(n-1), that is, 4 raised to the n-1 power.

Answer 12

Dont forget the -1 in the front.

Answer 13

-1• 4^(n-1)

Answer 14

Yes. Your welcome.

Answer 15

My apologies, THANK YOU :)