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Consider the following geometric sequence. -5, 10, -20, 40,... If the recursive formula for the sequence above is expressed in the form an=b(cn-1)nwhat is b and c

User YoYoMyo
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The formula of the geometric sequence is the following :

u_n=bc^(n-1) wherein b is the first term and c is the rate.
From the given data we deduce the parameters:

c=(10)/(-5)=-2,b=-5
Therefore:

u_n=-5(-2)^(n-1)
User Yburyug
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