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What is the sum of a 6-term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4?

1 Answer

Jan 1, 2016

Geometric Sum #S_n=[a_1 - a_(n+1)]/(1-r)#

Explanation:

For this problem ...

#a_1=11#

#a_(6+1)=-11264xx-4=45056#

Geometric Sum #S_6=[11 - 45056]/(1-(-4))=-9009#

Hope that helped

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