Use the summation formula to find a partial sum of a series with the following properties

Geometric

a1 = - 11

a7 = - 45,056

n = 7

r = - 4

Question

Mathematics

Javier Dillon

16 September, 08:32

Use the summation formula to find a partial sum of a series with the following properties

Geometric

a1 = - 11

a7 = - 45,056

n = 7

r = - 4

+1

Answers (1)

Know the Answer?

Sydney Pierce · Answer 1

-36,047.

Step-by-step explanation:

Sum of n terms = a1. (r^n - 1) / (r - 1)

So Sum of 7 terms = - 11. ((-4) ^7 - 1 / (-4-1)

= - 11 * - 16,385 / - 5

= - 36,047.

Use the summation formula to find a partial sum of a series with the following propertiesGeometrica1 = - 11a7 = - 45,056n = 7r = - 4

Use the summation formula to find a partial sum of a series with the following properties

Geometric

a1 = - 11

a7 = - 45,056

n = 7

r = - 4