Question

What are the first four terms of the sequence a1=−9 and an+1=an+n. I really need help with this im struggling

Answer 1

`a_(n+1)=a_n+n`

The formatting was a bit confusing, so please do let me know if this isn't the correct equation for the sequence.

The first term is given, which is

`a_1=-9`

Now, use the equation for the next terms:

`a_(1+1)=a_2=-9+1=-8`

`a_(2+1)=a_3=-8+2=-6`

`a_(3+1)=a_4=-6+3=-3`

Thus, the first 4 terms are -9, -8, -6, and -3. Let me know if you need any clarifications, thanks!