SOLUTION: which term of the geometric progression -2,8,-32, ....is 2048

Question 1152199: which term of the geometric progression -2,8,-32, ....is 2048
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.


First term is -2;  the common ratio is (-4).


The general term   = -.


So you need find "n" from the equation


    - = 2048.


It gives


     =  = -1024 = .


Hence,  n-1 = 5  and  n = 5+1 = 6.    ANSWER

Solved.

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