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labeled functions?

I need serious help on this Topic

So it would be \[2_{34}=2_{1}+7-2(34-1)\]

where did you get 2_(34)?

and 2_(1)?

you said replace n with 34

yes but what happen to the a_34?

and why didn't you replace a_1 with 2

you replaced it with 2_1 whatever that means

\[a_{34}=2+5(34-1)\]

anyways just follow order of operations to find a_(34)

Oh okay i see now

What about arithmetic Series.?

Are you wanting the sum formulas ?

Im still trying to fully comprehend this. I'm not very good at math :/

What is the difference between a series and a sequence.? (Just to add to my notes)

you know what sum means?

A series is a sum of the terms of a sequence.

I was just asking if you knew what sum meant because I basically already said this

Sum is the outcome of adding 2 or more number together.

you might also have seen this notation for the series:
\[\sum_{i=1}^{n}a_i\]

Also a series doesn't always have to start at i=1 and end at n

A series can be infinite.
And it can also start at i=2 etc...

Thanks for all your help man, i really appreciate it.

\[\sum_{i=1}^{n}a_1 r^{i-1}=a_1 \sum_{i=1}^{n} r^{i-1}=a_1 \frac{r^n-1}{r-1}\]

and that is the sum formula for a geometric series

Okay cool :)