Maths C1 Series and Sequences

Hi,
Im stuck on this question: "Prove that the (2n+1)th term of the sequence Un=n^2 -1 is a multiple of 4."

I've substituted the "(2n+1)" as "n" into the formula and got "U 2n+1=4n^2+4n+1-1" so i ended up with "U2n+1=4n^2+4n"... I don't know what to do from here on...

Help would be great, thanks

Hi,
Im stuck on this question: "Prove that the (2n+1)th term of the sequence Un=n^2 -1 is a multiple of 4."

I've substituted the "(2n+1)" as "n" into the formula and got "U 2n+1=4n^2+4n+1-1" so i ended up with "U2n+1=4n^2+4n"... I don't know what to do from here on...

Help would be great, thanks

Are you saying that you have $4n^2 + 4n$ and you cannot show that it is a multiple of 4?

Moved to the maths forum for you

In the answer section it says "Un=4n^2+4n" so i got confused because i ended up with "U2n+1=4n^2+4n"...