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Troyanec [42]
3 years ago
10

What is the sum of the geometric sequence -4,24,-144...if there are 8 term? A.-959,781 B. 29,637 C. 26,661 D. 959,780 PLEASE HEL

P
Mathematics
2 answers:
Serggg [28]3 years ago
7 0
It is d because I know it guys trust me it is easy.

iogann1982 [59]3 years ago
6 0

Answer:

The sum of 8 terms of series is 959,780

D is correct

Step-by-step explanation:

Given: -4, 24, -144, ......

There are 8 terms.

We need to find the sum of 8 terms.

First term, a=-4

Common ratio, r=-6

a_n=-4\cdot(-6)^{n-1}

Sum of 8 term

Sum=a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8

Sum=\sum_{n=1}^{8}a_n

Sum=-4+24-144+864-5184+31104-186624+1119744

Sum=959,780

Hence, The sum of 8 terms of series is 959,780

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