Answers

2016-07-21T22:45:49+08:00
-128 is the answer

why? because ...

1 term .) -1/2 × -2= 1
2 term .) 1 × -2 = -2
3 term .) -2 × -2 = 4
4 term .) 4 × -2 = -8
5 term .) -8 × -2 = 16
6 term .) 16 × -2 = -32
7 term .) -32 × -2 = 64
8 term .) 64 × -2 = -128
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