Question

What are the explicit equation and domain for a geometric sequence with a first term of 2 and a second term of -8?

Answer 1

a sub(n)= 2(-8)^n-1; all integers where n is greater than or equal to 1

a sub(n)= 2(-8)^n-1; all integers where n is greater than or equal to 0

a sub(n)= 2(-4)^n-1; all integers where n is greater than or equal to 0

a sub(n)= 2(-4)^n-1; all integers where n is greater than or equal to 1

Answer 2

general form is ar^(n-1) where a = first term and r = common ratio, n = term number

common ratio may be found by dividing second term by the first term

Answer 3

-4=r
a=2
n=n

Answer 4

right

Answer 5

now you need to look at values of n to find the domain

Answer 6

so the equation s 2(-4)^n-1; all integers where n is greater than or equal to ??

Answer 7

right so far
- the first term is 2
what value must n be for first term to be 2?

Answer 8

0?

Answer 9

Oops! 1

Answer 10

right

Answer 11

the second time?

Answer 12

so the last option is correct one

Answer 13

Thank you so much!!

Answer 14

yw

Answer 15

2* (-4)^(1-1) = 2* (-4)^0 = 2*1 = 2

Answer 16

Thank you!!