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# The nth term of a sequence is n^2+n watch

1. (Original post by sweetstars)
Thank you very much!
You should, however, write down the actual terms since that's what the question is asking for and not just the n values.
2. (Original post by brainmaster)
yes thanks for that.
however we could also use nth term - (n+1)th term = 32
but u get n as -15 and we know n can never be a negative hence u ignore the negative.
That hardly seems a sensible way to proceed and certainly not a method that would generalize.
3. (Original post by RichE)
That hardly seems a sensible way to proceed and certainly not a method that would generalize.
obviously this argument will only be valid for such cases since we know that one Part of the equation is being multiplied by -1 so the value of n will also be negative. I learnt this when I was dealing with a question on geometric sequence which said the difference between the third term and fifth term is ... And I came up with the equation 5th term - 3rd term = ... And solved for my unknown but I got a negative answer....when u see the marking scheme they do it the other way round but they had my method as an alternative.
however don't u think such questions or cases we should find the absolute or modulus of the solution to avoid arrows like in this case we find for | n |?
4. (Original post by RDKGames)
You should, however, write down the actual terms since that's what the question is asking for and not just the n values.
So 272 and 240? Thanks once again!!
5. (Original post by sweetstars)
So 272 and 240? Thanks once again!!
Yes.
6. (Original post by brainmaster)
obviously this argument will only be valid for such cases since we know that one Part of the equation is being multiplied by -1 so the value of n will also be negative. I learnt this when I was dealing with a question on geometric sequence which said the difference between the third term and fifth term is ... And I came up with the equation 5th term - 3rd term = ... And solved for my unknown but I got a negative answer....when u see the marking scheme they do it the other way round but they had my method as an alternative.
however don't u think such questions or cases we should find the absolute or modulus of the solution to avoid arrows like in this case we find for | n |?
"avoid arrows"? I'm afraid I have no idea what you're asking
7. (Original post by RichE)
"avoid arrows"? I'm afraid I have no idea what you're asking
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