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10 September, 07:14

Consider the following geometric sentence. - 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 of b and c

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  1. 10 September, 07:24
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    Hello:

    40/-20 = - 20/10 = 10 / - 5 = - 2 (common ratio)

    c = - 2

    b = - 5 (the first term)
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