snakeweed3093 snakeweed3093

15-05-2017
Mathematics

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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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ghanami ghanami

18-05-2017

hello :
40/-20 = -20/10 = 10 / -5 = -2 (common ratio )
c= -2
b = -5 ( the first term)

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