Sequences (Nth term)

If i have this sequence;

3,5,7,9

And i wanted to find out the nth term...

I would;

find the difference between each number

5-3=2

then i would find out the previous term

so i would;

3-2=1

So the nth term of my sequence is;     2n+1

If i had this nth term;

7n-4

And i wanted to know the first term, just substitute n for 1;

1 x 7=7
7-4=3

The first term is 3

If i wanted to know the 50th term

50 x 7= 350
350-4= 346 

I hope this helps anyone who is struggling with this :)

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If i have made any mistakes please comment below and i will make changes as soon as possible

Thanks :)