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What are the first four terms in the sequence generated by the formula? an=n^2+2n+1

User TheLaw
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1 Answer

17 votes
17 votes

Given the formula:


a_n=n^2+2n+1

First term:


a_1=1^2+2(1)+1=1+2+1=4

Second term:


a_2=2^2+2(2)+1=4+4+1=9

Third term:


a_3=3^2+2(3)+1=9+6+1=16

Fourth term:


a_4=4^2+2(4)+1=16+8+1=25

Answer: the first four terms are: 4, 9, 16 and 25

User Azin Nilchi
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