What is the sum of the geometric sequence −4, 24, −144, ... if there are 6 terms?

Asked by maham237 @ 22/12/2020 in Mathematics viewed by 302 People

-159,964
−26,661
26,661
159,963

Answered by maham237 @ 22/12/2020

The common difference is multiply f(n-1) by -6 and (f)1=-4

mutiply -144 by -6, then 864 by -6, then -5184 by -6. then 31104 by -6 to get -186624

so we have -4, 24, -144, 864, -5184, 31104, -186624 as the seven terms in the geometric sequence, now we just need to add these together and getting the final answer of -159,964

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