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Answer by CharlesG2(834)   (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

 

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