Question

find the general term sequence fora^n for the geometric system.

a1=-5 and a2=10

Answer 1

i tried to solve this equation a2=-5+(2-1)(10)

Answer 2

a geometric series is of the form

a, ar , ar^2..

general term is ar^(n-1)

Answer 3

well it has a and the n is at the bottom instead at the top a^2 is wrong i cannot find the correct button for a/n i think its a[n]

Answer 4

for the term sequence a[n]

Answer 5

if a = a1 = -5
and a2 = -10
then can you figure out what r is?

Answer 6

* a2 = 10

Answer 7

well bellow i dont know if i set the problem up to start off solving below

Answer 8

i have a2=-5+(2-1)(10)

Answer 9

that is an arithmetic sequence general term a1 + (n - 1)d

Answer 10

that is correct

Answer 11

its confusing because you said its geometric

Answer 12

well the given set up is a[n]=a1+(n-1) d and it ask for general term of sequence

Answer 13

that is the general term for an AS
a2 = -5 + (2 -1)d
= -5 + d

from this you can find the value of d , the common difference

Answer 14

i think d is 10 i am not sure

Answer 15

i got the answer a[n]=5

Answer 16

10 = -5 + d
d = 15

Answer 17

a(n) = -5 + (n - 1)15

Answer 18

ok so you added 10+5=15

Answer 19

so for example a5 = -5 + (5-1)15
= -5 + 60 = 55

Answer 20

yes

Answer 21

a(n)=-5+(5-1)15

Answer 22

oh i see you have answered it

Answer 23

thank you for taking the time with me

Answer 24

a(n) = -5 + (n-1)15

is general form

you just plug a value in for n - e.g. for 10th term you plug in n = 10

Answer 25

welcome