anonymous
  • anonymous
1.) write the sum using summation notation assuming the suggested pattern continues 4 - 12 +36 -108 +...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@welshfella @amoodarya
anonymous
  • anonymous
@Michele_Laino @iambatman @ganeshie8
anonymous
  • anonymous
@Astrophysics

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Michele_Laino
  • Michele_Laino
Hint: it is a geometric sequence, whose constant is: q=-108/36 = 36/(-12) = (-12/4= -3
Michele_Laino
  • Michele_Laino
and first term is a1=4
anonymous
  • anonymous
4(-3)^n or 4(-3)^(n-1)
Michele_Laino
  • Michele_Laino
the n-th term is therefore: \[\Large {a_n} = {a_1}{q^{n - 1}} = 4 \times {\left( { - 3} \right)^{n - 1}}\]
Michele_Laino
  • Michele_Laino
since we start to count, from n=1
anonymous
  • anonymous
thanks @Michele_Laino
Michele_Laino
  • Michele_Laino
:)

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