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23 September, 06:47

Write the explicit formula for the geometric sequence.

a1 = - 5 a2 = 20 a3 = - 80

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Answers (1)
  1. 23 September, 07:16
    0
    Geometric is

    an = (a1) (r^ (n-1))

    a1=first term

    r=common ratio

    so

    a1=-5, given

    a2=20 so

    a2=20=-5 (r^ (2-1))

    20=-5 (r^1)

    20=-5 (r)

    divide both sides by - 5

    -4=r

    the formula is

    an=-5 (-4) ^ (n-1)
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