SOLUTION: Expand the following sums: c) the summation from 2 to 5 of (-1)^i(x^(i-1))

Question 1049687: Expand the following sums:
c) the summation from 2 to 5 of (-1)^i(x^(i-1))
Answer by ikleyn(52788) (Show Source): You can put this solution on YOUR website!
.
Expand the following sums:
c) the summation from 2 to 5 of (-1)^i(x^(i-1))
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1-st term:  i=2:    =  = 1*x = x.


2-nd term:  i=3:    =  =  = .


3-rd term:  i=4:    =  =  = .


4-th term:  i=5:    =  =  = .


Finally, the sum of these four terms is  .

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