# SOLUTION: Write 2 - 4 + 8 - 16 + ... + 128 using sigma notation.

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

 Question 396669: Write 2 - 4 + 8 - 16 + ... + 128 using sigma notation.Found 2 solutions by ewatrrr, CharlesG2:Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! ``` Hi ```Answer by CharlesG2(828)   (Show Source): You can put this solution on YOUR website!Write 2 - 4 + 8 - 16 + ... + 128 using sigma notation. n = 1 --> -1^(2) = 1, 2^1 = 2, 1 * 2 = 2 n = 2 --> -1^(3) = -1, 2^2 = 4, -1 * 4 = -4 n = 3 --> -1^(4) = 1, 2^3 = 8, 1 * 8 = 8 ... n = 7 --> -1^(8) = 1, 2^7 = 128, 1 * 128 = 128