## keelyjm Group Title Is my answer correct for this summation notation problem? one year ago one year ago

1. keelyjm Group Title

Write the sum using summation notation, assuming the suggested pattern continues.1 - 3 + 9 - 27 + ...

2. keelyjm Group Title

|dw:1363357894822:dw| Is this correct?

3. Kanwar245 Group Title

wait, n has to start from 1 and not 0

4. keelyjm Group Title

The only choices are n=0

we shud notice that 1 is chanhing sign|dw:1363365221629:dw|

6. Kanwar245 Group Title

can you rewrite the series, I think you have not written it correctly

7. keelyjm Group Title

no that is what it says. I copied and pasted the question.

8. Kanwar245 Group Title

so the first two terms are positive?

9. keelyjm Group Title

No the first two terms are 1 and -3. Would this be better?|dw:1363358185671:dw|

yes thats better

11. keelyjm Group Title

Okay I was not so sure. Thank you!

12. Kanwar245 Group Title

thats not correct

13. Kanwar245 Group Title

the first term will be 0, lol!

14. terenzreignz Group Title

No it won't...

15. keelyjm Group Title

not necessarily if you look at the summation question I asked before this.

16. Kanwar245 Group Title

the series you gave had the first term 3

17. keelyjm Group Title

Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131 and the answer was $\sum_{n=0}^{15}9n-4$

18. Kanwar245 Group Title

anything to the power of 0 is 1!

19. keelyjm Group Title

and the first term was -4

20. Kanwar245 Group Title

yeah I wrote it in that way

21. Kanwar245 Group Title

there are more ways to write it

22. Kanwar245 Group Title

I hope you see it.

23. keelyjm Group Title

It depends on if it is finite or infinite

24. Kanwar245 Group Title

for example I could have written $\sum_{n=1}^{15}9(n-1)-4$

25. Kanwar245 Group Title

and that works too!!!!!!!!