Question

Please help me

How to find the recursive formula for 5,10, 20, 40...

Answer 1

The general equation is

t(n) = t(n-1)+d

Answer 2

you're using the wrong recursive general equation

you should be using this

t(n) = r*t(n-1)

where t(n) is the nth term, r is the common ratio, and t(n-1) is the term before the nth term

Answer 3

Would this be correct then?

t(n) = t(n-1)*2 ?

Answer 4

or

t(n) = 2*t(n-1)

good

Answer 5

Thanks and what about the general term formula?

Answer 6

well this is a geometric sequence with first term a = 5, common ratio r = 2

Answer 7

so you tell me

Answer 8

t(n) = 5 + something?

Answer 9

no

Answer 10

the nth term of a geometric sequence is found by

t(n) = a*r^(n-1)

Answer 11

What does r stand for?

Answer 12

r is the common ratio

Answer 13

to find the next term, you multiply by the common ratio

Answer 14

Ok, so I got

t = 5*2(n-1)

Answer 15

I understand this know, i appreciate your help alot

Answer 16

more like

\[\Large t(n) = 5*2^{n-1}\]

but I think that's what you meant to say

Answer 17

Yes, thanks

Answer 18

yw