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# geometric series as level help watch

1. Hi there I have provided a picture which an arrow highlighting my problem..

If you would help me that would be really good! thanks
2. This comes down to the fact that 4=2^2 and cancelling.
Hi there I have provided a picture which an arrow highlighting my problem..

If you would help me that would be really good! thanks

2 to the power of negative two is a quarter, so it's the same as dividing by 4
4. Divide top and bottom by 4

5. (Original post by Indeterminate)

2 to the power of negative two is a quarter, so it's the same as dividing by 4
why do we have to divide by 4?:P
why do we have to divide by 4?:P
We divide by 4 to reduce the fraction to its simplest form
7. (Original post by Indeterminate)
We divide by 4 to reduce the fraction to its simplest form
Okay I am going to sound really dumb for an alevel student but I just CANNOT see how we have went from n-1 to n-3.. i think I missing something really obvious or else I am thick... I think it's probably the latter haha
Okay I am going to sound really dumb for an alevel student but I just CANNOT see how we have went from n-1 to n-3.. i think I missing something really obvious or else I am thick... I think it's probably the latter haha
It's ok.

using the fact that

for all non-zero x.

Now can you see it?
9. (Original post by SubAtomic)
Divide top and bottom by 4

thank you but I still am not sure about how it becomes n-3.. i think I am missing something really obvious

Would you mind explaining further? really sorry to sound silly thanks
thank you but I still am not sure about how it becomes n-3.. i think I am missing something really obvious

Would you mind explaining further? really sorry to sound silly thanks
I forgot to mention that

11. (Original post by Indeterminate)
It's ok.

using the fact that

for all non-zero x.

Now can you see it?
ahhh yes okay thank you so much for that! + 1 rep
12. (Original post by Indeterminate)
I forgot to mention that

ohh yea I know that rule, cheers (i repped you on this post btw
...
I think you have it now right?

14. (Original post by SubAtomic)
I think you have it now right?

yea got it now thanks dude thanks for your replies anyway.. +1 rep

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