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what is the sum of the first 7 terms of the series

-8+16-32+64-

(edit: im not so good at series and sequences and you guys are helpful w the explanations)

 Mar 20, 2019
edited by Nuggetguy  Mar 20, 2019
 #1
avatar+19326 
+3

Geometric series     r = -2    a1 = -8   n = 7

 

S7 = a1 (1-r^n) / (1-r)   = -344

 Mar 20, 2019

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