Question

Find S8 for the geometric series 3 + -6 + 12 + -24 +…

Answer 1

A. -255
B. 768
C. -96
D. 192

Answer 2

\( \color{Black}{\Rightarrow \Large S_n = a{1 - r^n \over 1 - r} }\)

a is the first term.
r is the ratio.
n is the number of terms.

Answer 3

\( \color{Black}{\Rightarrow \Large S_8 = 3{1 - (-2)^8 \over1 - (-2)} }\)

Answer 4

Note that 3 and that fraction are getting multiplied.

Answer 5

what is the answer though haha

Answer 6

\( \color{Black}{\Rightarrow \Large 3 \times {1 + 2^8 \over 3}}\)