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

Question

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

5*2^7-1=320

anonymous · Answer

?

anonymous · Answer

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.