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Find the tneth term of the sequence.

 

3, 2, -1, -6, -13,...

 

 

The tenth term is=

 Dec 15, 2020
 #1
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+1

-1    -3    -5    - 7   -9  -11  -13   -15   -17    -19

3    2   -1    -6    -13  -22  -33  -46   -51  -68    -87     

 Dec 15, 2020
 #3
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0

*** edited ****    Made a small math error

 

-1    -3    -5    - 7   -9  -11  -13   -15   -17 

 

3    2   -1    -6    -13  -22  -33  -46  -61  -78

Guest Dec 15, 2020
 #2
avatar
+1

Your sequence is:

 

3, 2, -1, -6, -13, -22, -33, -46, -61, -78, -97, -118, -141, -166, -193, ...etc.

 

Closed form: a_n = -n^2 + 2 n + 2 

 

10th term: a(10) =- 10^2 + 2*10 + 2 == - 78

 Dec 15, 2020

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