Help find the sum of the first six termss of the geometric series?

label Algebra
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Help find the sum of the first six terms of the geometric series?

2-6+18-54+...

May 20th, 2015

a1 = 2, 

r = -6/2 or -54/18 = -3

The formula finding the sum of GP  when |r| < 1

is  S = a(1−rn)/(1−r)

S = 2(1- (-3)^6)/(1-(-2)

= -364

Hope this helps. You can ask any question if you are not comfortable.

May 20th, 2015

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