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22 April, 18:41

If the nth term of the sequence - 1, 4, 9, 14 ... Is 129. Then find the value of n.

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Answers (2)
  1. 22 April, 19:17
    0
    27

    Step-by-step explanation:

    129 - (-1) = 130

    130/5 = 26

    26+1 = 27
  2. 22 April, 21:43
    0
    n = 27

    Step-by-step explanation:

    This is Arithmetic sequence

    a = - 1

    Common difference = 4 - (-1) = 4 + 1 = 5

    an = a + (n-1) d

    129 = - 1 + (n-1) * 5

    129 + 1 = (n-1) * 5

    130 = (n-1) * 5

    130/5 = n - 1

    26 = n - 1

    n = 26 + 1

    n = 27
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