Question

Here is a geometric series in summation notation:

5
E (-2)^i+1
i=1

What is the sum of the series?
(The E isn't what the symbol completely looks like but it's close)

A: -124
B: 132
C: -84
D: 44
E: -44

Answer 1

they want you to add together 5 numbers ....

Answer 2

5
E (-2)^i+1
1

5
E (-2)^i (-2)^1
1

5
-2 E (-2)^i
1

-2( (-2)^1 + (-2)^2 + (-2)^3 +(-2)^4 +(-2)^5)