Question

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Answer 1

Does the series converge or diverge? If it converges, what is the sum?

Answer 2

it is -4 + 2 - 1 + 1/2 - ...
r = a2/a1 = 2/-4 = -1/2
so, the series be convergent

Answer 3

Ok. How do you find the sum?

Answer 4

use the formula :
S = a1/(1-r) = -4/(1- (-1/2)) = -4/(1+1/2) = -4/(3/2) = - 8/3

Answer 5

Ok thank you! the sum is -8/3? And that helped alot!

Answer 6

welcome ;)