Question

What is the sum of the geometric sequence -4, 24, -144,... if there are 8 terms?
-959,781
29,637
26,661
959,780

Answer 1

I think its B, but don't quote me on that

Answer 2

wait

Answer 3

sum = (first term)

Answer 4

(-4 - (common ratio)^(number of terms)) / -4 - common ratio)

Answer 5

okay, can you tell me the:
1) \(\large\color{black}{ a_1 }\)
2) \(\large\color{black}{ r }\)

Answer 6

And the common ratio is -6? so '
-4(-6)^8-1?

Answer 7

1) a1 is -4
2) r is -6