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28 November, 07:22

Consider the following geometric sequence

-5,10,-20,40

if the explicit formula for the sequence above is expressed in the form an=b*c^n-1, determine the values pf b and c

b=

c=

+3
Answers (1)
  1. 28 November, 07:33
    0
    A geometric sequence is of the form:

    a (n) = ar^ (n-1), a=initial term, r=common ratio, n=term number ... in this case:

    a (n) = - 5 * (-2) ^ (n-1)

    So for your question:

    b=-5 and c=-2
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