Question

Find the 7th term of a geometric sequence with t1=5 and r = -2.

Answer 1

Don't be afraid. I will behave and not fight this time.

Are you familiar with the geo seq formula?

an = a1 * r ^ (n-1)

an is a future term
a1 is the first term
n is the number of the term represented by an

Answer 2

Yes I Know That Equation But I Get Stuck When i Plug Everything in together

Answer 3

5*2^7-1=320

Answer 4

?

Answer 5

The 2 should be a negative 2. With even powers there is no difference, but with odd powers it's a big deal. My calculator shows

5 *(-2)^(7-1)
320

We got the same answer because of the even power.