Question

What is the sum of the geometric sequence −4, 24, −144, … if there are 7 terms?-159,964 

−26,661

26,661 

159,963 

Answer 1

Answ

-159,964

Step-by-step explan

I got it right on the test

Answer 2

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