Find the sum of the geometric sequence -4,24,-144,... if there are 8 terms

Jenny Schroeder

Jenny Schroeder

Answered question

2022-11-05

Find the sum of the geometric sequence -4,24,-144,... if there are 8 terms

Answer & Explanation

Miah Carlson

Miah Carlson

Beginner2022-11-06Added 17 answers

Sum of geometric sequence is a ( r n - 1 ) r - 1
where
a = your first number
r = the ratio
n = number of terms
In this case,
a = - 4
r = 24 - 4 = - 144 24 = - 6
n = 8
Sum
a ( r n - 1 ) r - 1
- 4 ( ( - 6 ) 8 - 1 ) - 6 - 1
- 4 × 1679615 - 7
- 6718460 - 7
959780

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