Question

Find a8 for the geometric series with

Answer 1

\[\large a_{8}= (4)(2)^{8-1}\]

Answer 2

do you understand why...

Answer 3

yeah its the formula sn=a1(1-r)/(1-r)

Answer 4

what are all these Ss and As

Answer 5

No Geometric series is \[\large \sum_{n=1}^{8}4(2)^{8-1}\]

Answer 6

oohhhh

Answer 7

Geometric Series\[\large \sum_{n=1}^{n}a_{1}r^{n-1}\]

Answer 8

i got 4096

Answer 9

you know what would be helpful? It'd be a good idea to make a flashcard with all the types of series on it. You could refer back to them when applying diference series and sequence tests .

Answer 10

different*

Answer 11

That's what I did when I was learning Series and Sequences.

Answer 12

\[\large a_{8} = 4\times 2^7= 512.\]

Answer 13

aha oh

Answer 14

How did you get 4096?

Answer 15

so confusing..

Answer 16

what is the difference between S8 and A8

Answer 17

S means the sum of the geometric series, a8 means the 8th number in the series.