Middle School

What is the sum of the geometric sequence −4, 24, −144, … if there are 7 terms?

A. −159,964
B. −26,661
C. 26,661
D. 159,963

Answer :

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

Answ

-159,964

Step-by-step explan

I got it right on the test

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