SOLUTION: Use the formula for the sum of the first n terms of a geometric sequence to solve. Find the sum of the first 11 terms of the geometric sequence 4,-12,36,-108....

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Sequences-and-series Question 481815: Use the formula for the sum of the first n terms of a geometric sequence to solve. Find the sum of the first 11 terms of the geometric sequence 4,-12,36,-108....Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! ``` Hi, geometric sequence: {4,-12,36,-108,...} r = -3 ```