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1 January, 16:25

Write an explicit formula for the sequence - 4, 1, 6, 11, ...

an = - 4 + 5 (n+1)

an = - 4 + 5 (n-1)

an = - 4 + (n-1)

an = - 4 + 5n

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Answers (2)
  1. 1 January, 17:43
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    An = - 4 + 5 (n+1) A I Think
  2. 1 January, 17:54
    0
    This is an arithmetic sequence because each term is 5 more than the previous term, the defining characteristic of an arithmetic sequence which is called the common difference. All arithmetic sequences can be expressed as:

    a (n) = a+d (n-1), a=1st term, d=common difference, n=term number, in this case a=-4 and d=5 so

    a (n) = - 4+5 (n-1)
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